1. Stainless steel ball 2. Low price & High Hardness 3. OEM service accepted 4. Low noise ... 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 ... bearing, pulley, slide, handcraft, shelf, luggage, hardware, grinding mediaStandardGB/T-308-2002, GB/T1148-93Matched StandardDIN, JIS, ...