... . Grade: 3-1000 2. Size: 0.5-200mm Steel ball made by our factory are widely used in machinery, bearings, ... steel balls:1. Grade: 3-10002. Size: 0.5-200mm3. Materials: alloy steel ball, aluminium ball, carbon steel ball, ceramic ball, chrome steel ball for bearing, copper ball, stainless steel ball, bearing stell ball steel ball ...