... from primary processing of wire to high-level precision steel ball.MAIN PRODUCTS:1. Stainless steel ball, with material AISI304, 316, 420C, 440C2 ... , bearings, trust bearings pulleys, chemical industries, etc.DETAIL SPECIFICATION: ItemAISI420 Stainless Steel BallCategoryStainless Steel BallMaterialAISI420Size2.0 mmGradeG500Hardness ( HRC)HRC58-65ApplicationBicycle, bearing, pulley, slide ...