Marble groove bearing, sliding, fashionable and flexible. The product is an outer ring with U-shaped groove roller bearings made of engineering plastics, compression wear. Each can bear 77kg, good; use and long service life. Suitable for furniture accessories, pulleys and door and window counters. < li> The diameter of the bearing pulley is 24mm, the inner diameter is 6mm, and the width is 9mm. Please check the product size before purchasing to avoid gaps. When installing the pulley, first straighten the top of the door pulley and insert a wrench. Hexagon 6mm, loosen the screw, remove the upper pulley in parallel, then screw in a new screw, and put a piece of cardboard between the top edge of the door frame and the pulley, then tighten the screws, and the installation is successful. Hardware Engineering plastic + bearing steel < td>Color White td> < /tr> Inside diameter 6MM Outer diameter 24MM Thickness 9MM Slot depth 3MM Slot width 6.4 MM Dimensions 0.6 x 2.4 x