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.<br> Stainless steel manufacturing, rust - proof, - , outdoor use can also prevent pulley .<br> Compared with other pulleys, pulley wheel support plate is thicker, the wheels are stronger and the bearing capacity is stronger.<br> Pulleys are removable for easy installation. A single small pulley can carry 660lb/300kg<br> Specification<br> Product Name: U Type Pulley<br> Color: Silver<br> Material: 304 stainless steel<br> Installation height: 54mm(2.125in)<br> Wheel diameter: 48mm(1.889in)<br> Wheel thickness: 22mm(0.866in)<br> Groove width: 16 mm(0.629in)<br> Groove depth: 7 mm(0.27in)<br> Product weight: 280g(0.617lb)<br> Load: 300 kg (660 Ib)<br> Application<br> Generally used as a rail wheel Grooved Wheel<br> Package Contents:<br> 1pcs * U-Type Pulley<br> Only the above package content, other products are not included.<br> 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.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store