We offer discount for large quantity. Welcome to us!2pcs U 304 Stainless Steel Pulley Steel Pulley Rollers Duplex Having Quiet Detachable Heavy Duty Grooved Loading WheelsInside the pulley, there are two carbon steel ball bearings, which can reduce the friction of the pulley. The pulley rotates more flexibly and without noise. Stainless steel production, rust-proof, corrosion-resistant, outdoor use can also prevent the pulley from corrosion. Compared with other pulleys, the pulley is thicker, the pulleys are stronger, and the bearing capacity is stronger. The pulleys are removable for easy installation. A single small pulley can carry 660lb/300kgThe clearance between the wheels and the frame is only about 12mm, so the rope with too large a diameter cannot be exceeded. Usually used as a grooved rail pulleyProduct name: U type pulleyMounting height: 54mm (2.125 inch)Wheel diameter: 48mm (1.889 inch)Wheel thickness: 22mm (0.866 inch)Groove width: 16mm (0.629 inch)Groove depth: 7mm (0.27 inch)Product weight: 280g(0.617lb)Load: 300kg(660 Ib)Application: usually used as a grooved rail wheel. Size: 30x54mm Material: 304 Stainless Steel Color: Silver Package Contents: 2 x Scroll WheelOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm. About UsWe provide good product with best price, we support wholesale order/