Bearing Surface Roughness : Ra 0.05 Model Number : 6802ZZ Coatings : no Material : STEEL Type : Ball bearing 6802zz Unit Type : Lot (5/10 pieces/lot) Package Weight : 0.10kg (0.33lb.) Package Size : 10cm x 10cm x 10cm (3.94in x 3.94in x 3.94in)