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MW 12x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010016

GTIN/EAN: 5906301810155

5.00
Load capacity 4.83 kg / 47.41 N Magnetic Induction 531.09 mT / 5311 Gs
Diameter Ø
12 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
8.48 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
check parameters »

3.03 zł with VAT / pcs + price for transport

2.46 zł net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Call us +48 22 499 98 98 otherwise get in touch via contact form the contact form page.
Parameters along with form of a neodymium magnet can be verified with our power calculator.

Orders placed before 14:00 will be shipped the same business day.

Technical data - MW 12x10 / N38 - cylindrical magnet

Specification / characteristics - MW 12x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010016
GTIN/EAN 5906301810155
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 12 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 8.48 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.83 kg / 47.41 N
Magnetic Induction ~ ? 531.09 mT / 5311 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x10 / N38 - cylindrical magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Engineering analysis of the product - data

These values are the result of a engineering calculation. Values were calculated on models for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MW 12x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5308 Gs
530.8 mT
 4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
 warning
1 mm 4424 Gs
442.4 mT
 3.36 kg / 7.40 pounds
3355.3 g / 32.9 N
 warning
2 mm 3585 Gs
358.5 mT
 2.20 kg / 4.86 pounds
2203.4 g / 21.6 N
 warning
3 mm 2857 Gs
285.7 mT
 1.40 kg / 3.08 pounds
1399.2 g / 13.7 N
 safe
5 mm 1787 Gs
178.7 mT
 0.55 kg / 1.21 pounds
547.8 g / 5.4 N
 safe
10 mm 622 Gs
62.2 mT
 0.07 kg / 0.15 pounds
66.3 g / 0.7 N
 safe
15 mm 272 Gs
27.2 mT
 0.01 kg / 0.03 pounds
12.7 g / 0.1 N
 safe
20 mm 141 Gs
14.1 mT
 0.00 kg / 0.01 pounds
3.4 g / 0.0 N
 safe
30 mm 52 Gs
5.2 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 safe
50 mm 13 Gs
1.3 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Magnetic force drops drastically with every mm of spacing. Keep in mind that even a microscopic distance (e.g., contamination, varnish, dust) noticeably weakens the grip. Magnets hold strongest at the point of direct contact; gap kills the power. See how quickly the parameters plummet, when the product does not touch tightly to the metal substrate. When planning the mounting, discard additional spacers.

Table 2: Sliding capacity (vertical surface)
MW 12x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.97 kg / 2.13 pounds
966.0 g / 9.5 N
1 mm Stal (~0.2) 0.67 kg / 1.48 pounds
672.0 g / 6.6 N
2 mm Stal (~0.2) 0.44 kg / 0.97 pounds
440.0 g / 4.3 N
3 mm Stal (~0.2) 0.28 kg / 0.62 pounds
280.0 g / 2.7 N
5 mm Stal (~0.2) 0.11 kg / 0.24 pounds
110.0 g / 1.1 N
10 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data presents the theoretical force required to cause the downward movement of the magnet vertically against a upright metal surface (considering typical friction coefficient). This value varies with the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 12x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.45 kg / 3.19 pounds
1449.0 g / 14.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.97 kg / 2.13 pounds
966.0 g / 9.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.48 kg / 1.06 pounds
483.0 g / 4.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.42 kg / 5.32 pounds
2415.0 g / 23.7 N
When hanging a holder on a vertical surface (e.g., a board), it will maintain just about 20%-30% of its nominal power. Gravity as well as a weak degree of grip cause that magnets slide down easier than they pop off the substrate. Designing a hanger? Remember that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the element will slide down under a noticeably lighter load. Using a rubber layer can effectively increase the grip.

Table 4: Material efficiency (saturation) - power losses
MW 12x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.48 kg / 1.06 pounds
483.0 g / 4.7 N
1 mm
25%
 1.21 kg / 2.66 pounds
1207.5 g / 11.8 N
2 mm
50%
 2.42 kg / 5.32 pounds
2415.0 g / 23.7 N
3 mm
75%
 3.62 kg / 7.99 pounds
3622.5 g / 35.5 N
5 mm
100%
 4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
10 mm
100%
 4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
11 mm
100%
 4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
12 mm
100%
 4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
A thin metal plate cannot conduct the entire magnetic field, which squanders power of the holder. If you attach a powerful product to a weak sheet, the field will penetrate right through and the holding will be smaller. To utilize 100% of this magnet's potential, you need a suitably thick backing of steel. The saturation effect causes that on sheet metal structures (e.g., car bodies), the product works worse. We advise picking the steel thickness according to the table below.

Table 5: Working in heat (stability) - thermal limit
MW 12x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
 OK
40 °C -2.2% 4.72 kg / 10.41 pounds
4723.7 g / 46.3 N
 OK
60 °C -4.4% 4.62 kg / 10.18 pounds
4617.5 g / 45.3 N
 OK
80 °C -6.6% 4.51 kg / 9.95 pounds
4511.2 g / 44.3 N
100 °C -28.8% 3.44 kg / 7.58 pounds
3439.0 g / 33.7 N
Standard neodymium magnets lose strength after exceeding the maximum temperature. Avoid high temperatures – high temperature can irreversibly damage this product. As the temperature rises, the magnet's capacity temporarily decreases. Avoid using this magnet close to heaters exceeding its working range. Exceeding the critical threshold will result in permanent loss of magnetic properties.
*Important note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) risk losing magnetic properties under lower heat stress compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field collision
MW 12x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 19.64 kg / 43.30 pounds
5 928 Gs
2.95 kg / 6.50 pounds
2946 g / 28.9 N
 N/A
1 mm 16.52 kg / 36.43 pounds
9 736 Gs
2.48 kg / 5.46 pounds
2479 g / 24.3 N
 14.87 kg / 32.79 pounds
~0 Gs
2 mm 13.64 kg / 30.08 pounds
8 847 Gs
2.05 kg / 4.51 pounds
2047 g / 20.1 N
 12.28 kg / 27.07 pounds
~0 Gs
3 mm 11.12 kg / 24.51 pounds
7 986 Gs
1.67 kg / 3.68 pounds
1668 g / 16.4 N
 10.01 kg / 22.06 pounds
~0 Gs
5 mm 7.16 kg / 15.79 pounds
6 410 Gs
1.07 kg / 2.37 pounds
1074 g / 10.5 N
 6.45 kg / 14.21 pounds
~0 Gs
10 mm 2.23 kg / 4.91 pounds
3 575 Gs
0.33 kg / 0.74 pounds
334 g / 3.3 N
 2.00 kg / 4.42 pounds
~0 Gs
20 mm 0.27 kg / 0.59 pounds
1 244 Gs
0.04 kg / 0.09 pounds
40 g / 0.4 N
 0.24 kg / 0.54 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
164 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
104 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
70 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
49 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
36 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
27 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of action. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Remember that when bringing together two magnets, the impact force is extreme. The repulsion force is a bit weaker than the attraction, but still significant.
*Flux density in repulsion mode drops to ~0 Gs at the midpoint of the gap (due to field cancellation).
Attention: Results apply to friction force of two identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 12x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.5 cm
Hearing aid 10 Gs (1.0 mT) 6.0 cm
Timepiece 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field poses a large risk to electronic devices and medical implants. These NdFeB products generate a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MW 12x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.58 km/h
(5.16 m/s)
 0.11 J
30 mm 18.75 km/h
(5.21 m/s)
 0.11 J
50 mm 18.75 km/h
(5.21 m/s)
 0.12 J
100 mm 18.75 km/h
(5.21 m/s)
 0.12 J
Neodymium magnets are prone to chipping – a strong collision with metal risks their cracking. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 12x10 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MW 12x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 105 Mx 61.1 µWb
Pc Coefficient 0.81 High (Stable)
Total magnetic flux passing through the magnet pole. Essential parameter for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MW 12x10 / N38

Environment Effective steel pull Effect
Air (land) 4.83 kg Standard
Water (riverbed) 5.53 kg
(+0.70 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.

3. Power loss vs temp

*For standard magnets, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.81

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR

Elemental analysis

iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%

Environmental data

recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 010016-2026
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The presented product is an incredibly powerful rod magnet, composed of modern NdFeB material, which, at dimensions of Ø12x10 mm, guarantees the highest energy density. The MW 12x10 / N38 model is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 4.83 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 47.41 N with a weight of only 8.48 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø12x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 12 mm and height 10 mm. The key parameter here is the lifting capacity amounting to approximately 4.83 kg (force ~47.41 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 10 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths and weaknesses of rare earth magnets.

Pros

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They possess excellent resistance to magnetic field loss due to external magnetic sources,
  • A magnet with a metallic nickel surface has an effective appearance,
  • Neodymium magnets create maximum magnetic induction on a small surface, which increases force concentration,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of precise forming and adjusting to concrete applications,
  • Universal use in electronics industry – they find application in mass storage devices, brushless drives, advanced medical instruments, and industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Characteristics of disadvantages of neodymium magnets: application proposals
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited possibility of making threads in the magnet and complicated shapes - recommended is cover - mounting mechanism.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Maximum holding power of the magnet – what affects it?

The lifting capacity listed is a theoretical maximum value performed under the following configuration:
  • with the contact of a sheet made of special test steel, guaranteeing maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • with an ground touching surface
  • without any insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Key elements affecting lifting force

In real-world applications, the real power depends on many variables, ranked from crucial:
  • Air gap (between the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Plate material – mild steel gives the best results. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Surface structure – the more even the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate lowers the lifting capacity.

Warnings
Powerful field

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Life threat

Patients with a ICD should maintain an safe separation from magnets. The magnetic field can stop the operation of the life-saving device.

Physical harm

Big blocks can break fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.

GPS Danger

GPS units and smartphones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Fire risk

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Protective goggles

NdFeB magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them cracking into small pieces.

Cards and drives

Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.

Swallowing risk

Strictly store magnets out of reach of children. Choking hazard is high, and the effects of magnets clamping inside the body are tragic.

Nickel allergy

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, immediately stop working with magnets and wear gloves.

Power loss in heat

Control the heat. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Warning! Details about hazards in the article: Magnet Safety Guide.