There are two carbon steel bearings inside the pulley, which help reduce wheel friction. The pulley turns smoothly and operates quietly. Made of stainless steel, it is rust-proof and corrosion-resistant, suitable for outdoor use without risk of pulley deterioration. Compared to other pulleys, this model features a thicker support plate, providing increased wheel strength and higher load capacity. The pulley is removable for easy installation. Each single pulley can support up to 660 lb (300 kg). 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 grooved wheel for rail systems Package Contents 1 x U-Type Pulley Note: Other items not included. Lighting and monitor settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 13 cm.