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.Ball support cup made of High quality carbon steel.4.Suitable for transmission system, feeding system, processing system, processing machinery and packaging machinery auxiliary equipment.5.Protective cover assures low torque and longevity.Specifications:Material: G200 Carbon SteelColor:SilverBrand name: BQLZRSize:5x3x2cm/1.97x1.18x0.79 Inch ( L x Dia x H )Hole to Hole:3.5CMWeight:408gPackage include:10x Transfer Bearing Conveyor Roller Wheels