China AISI304 High Hardness Stainless Steel Ball with Top Quality 7.937mm 8.731mm 9.525mm, Find details about China Stainless Steel Ball, AISI 420c 440c Stainless Steel Ball G10-G1000 from AISI304 High Hardness Stainless Steel Ball with Top Quality 7.937mm 8.731mm 9.525mm