There are two carbon steel ball bearings inside the pulley, which can reduce the friction of the wheel. The pulley rotates more flexibly and makes no noise. Stainless steel manufacturing, rust-proof, corrosion-resistant, outdoor use can also prevent corrosion of the pulley. Compared with other pulleys, the carrier plate of the pulley wheel is thicker, the wheels are stronger and the load capacity is higher. Application: steel cable wheel, transmission equipment, industrial pulley. For long lasting durability against heat, shock and corrosion Product Description Features: Material: iron + bearing steel. Color: titanium. Maximum load: 250 kg. Inner diameter: 8 mm. p> Outer diameter: 40 mm. Thickness: 13 mm. Groove width: 10 mm. Groove depth: 7.5 mm. Radiant: R = 5 mm. Dimensions: 40 x 13 mm. Weight: 99 g.