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.Made of steel and nylon.4.With M10x20mm thread stem.5.The advantages of nylon ball are silent, wear resistant and non-conductive.6.Widely used in transmission systems, feeding systems, processing systems, packaging auxiliary equipment, etc.Specifications:Material: Nylon(Ball) + SteelColor: SilverBrand name: BQLZRThread: M10x20mmBall Diameter: 22mmSize: 5.3x3.6cm/2.09x1.47inch(HxDia)Load Bearing: 90KGWeight: 164gPackage include:1 x Ball Transfer Bearing