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Grinding Metal Round AISI Sizes Customezed High Hardness AISI 52100 G10 9.525mm 11.1125mm 15mm Chrome Steel Ball for Bicycle, Find Details and Price about Bearing Balls Chrome Bearing Balls from Grinding Metal Round AISI Sizes Customezed High Hardness AISI 52100 G10 9.525mm 11.1125mm 15mm Chrome Steel Ball for Bicycle - OPQ Chemical Co., Ltd