There are two carbon steel ball bearings inside the pulley, which can reduce the friction of the wheel. The pulley turns more flexibly and operates quietly. Made of stainless steel, rust-proof, suitable for outdoor use. Compared with other pulleys, the pulley wheel support plate is thicker, providing stronger wheels and higher load capacity. Pulleys are removable for easy installation. A single small pulley can carry up to 300 kg (660 lb). Specification Product Name: U Type Pulley Color: Silver Material: 304 Stainless Steel Installation Height: 54 mm (2.125 in) Wheel Diameter: 48 mm (1.889 in) Wheel Thickness: 22 mm (0.866 in) Groove Width: 16 mm (0.629 in) Groove Depth: 7 mm (0.27 in) Product Weight: 280 g (0.617 lb) Load Capacity: 300 kg (660 lb) Application Commonly used as a rail wheel or grooved wheel. Package Contents 1 x U-Type Pulley Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.