Pulleys are removable for easy installation.Compared with other pulleys, pulley wheel support plate is thicker, the wheels are stronger and the bearing capacity is stronger. Stainless steel manufacturing, rust - proof, corrosion - resistant, outdoor use can also prevent pulley corrosion. The thickened steel plate bracket and wheel core can enhance the bearing capacity. A single small pulley can carry 660lb/300kg There are two carbon steel ball bearings inside the pulley, which can reduce the friction of the wheel. The pulley turns more flexibly and has no noise. Product Name: V Type Pulley Installation height: 54mm(2.125in) Wheel diameter: 48mm(1.889in) Wheel thickness: 22mm(0.866in) Groove width: 16 mm(0.629in) Groove depth: 7 mm(0.27in) Load: 300 kg (660 Ib) Application:Generally used as a rail wheel Grooved Wheel size:54 x 22mm Material:steel colour:Silver Package Contents: 4 x V-Type Pulley Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.