... precision steel ball.MAIN PRODUCTS:1. Stainless steel ball, with material AISI304, 316, 420C, 440C2. Steel ball, with material AISI 1008-1086.3. Chrome steel ball,with ... , etc.DETAIL SPECIFICATION: ItemAISI440 Stainless Steel BallCategoryStainless Steel BallMaterialAISI440Size2.0 mmGradeG500Hardness ( HRC)HRC58-65ApplicationBicycle, bearing, pulley, slide, handcraft, shelf, luggage, hardware, ...