ITEM NAME:5PCS CY-15H 32mm Ball Metal Transfer Bearing Unit Conveyor Roller Wheels BX 100% Brand new and high quality. Material:Â Steel Color: Silver Diameter: 32mm Conversion: 1mm=0.039 inch, 1 inch=25.4mm Features: Ball Transfer Unit can also be used in a variety of non-industrial applications, including retail store displays and airport luggage transfers. Ball support cup is hardened and plated. Notice: 1.Please allow 1-3mm error due to manual measurement,Please make sure you do not mind before you.5pcs Ball Transfer Unit. Ball support cup is hardened and plated. Material: Steel. Color: Silver.