0840UU 8mm Groove Guide Pulley Sealed Rail Ball Bearing 8x40x20.7mm ROB44, R38

Description8mm U Groove Ball Bearing 0840UU Groove Guide Pulley Sealed Rail Ball Bearing 8*40*20.7 mmU type pulley, the internal bearing fine bearing steel. Strong bearing capacity, flexible rotation, internal upgrade stainless steel bearings, can be used in the wet environment, not rust.Specifications:Material: nylon Bearing Color: black Inner diameter: 8mm Outer diamter: 40mm Width: 20.7mmFeatures:Load more than 50KG, smooth operation, good mute effect. Internal lubrication grease , can be used in the wet environment, not rust. Widely used in doors and windows to track and drive mechanical equipment.