Description Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Deep groove ball bearings, fashionable, slide flexible, compression 4.Made of bearing steel, widely used in application where high abrasion resistance is essential5.It is suitable for slide Bathroom door and closet door.Suitable for furniture hardware accessories, mobile doors, glass sliding doors, aluminum doors .Specifications:Material:Bearing steelColor:Silver Loadbearing(each): 167kgSize:Inner Diameter(ID): 5mmOuter Diameter(OD): 2.3mmSize: 0.5x2.3x0.65cm/0.2x0.91x0.26Inch(IDxODxH)Weight:62gPackage include:4 x Bearing Pulleys