Material:AISI304,316,420C,440C Size:0.8mm-150mm Grade: G10-G1000 Standard:ISO 9001:2008/SGS test report/ROHS report Stainless steel ball Name: Stainless steel ballsMaterial: AISI304,316,420C,440CSize: 0.8mm-150mmGrade: G10-G1000Hardness: AISI304 and AISI316 are soft materials. For AISI420C after heat-treatment, the hardness is between HRC54-60. For AISI440C is HRC58-62Quality standard: ISO 9001: ...