Deep groove ball bearings 1, 6205, 6206,6208, 6209, 6210 2, Material:GCr15 3, Hardness:60-63 Deep groove ball bearings1, 6205, 6206,6208, 6209, 62102, Material:GCr153, Hardness:60-634, Internal diameter:25mm-50mm5, Outer diameter:50mm-90mm Deep groove ball bearings