... 1015 1045 1085 2.hardness:60-65HRC 3.size:1/4" 4.Grade:G500/G1000 ISO qulified company ... partssize1/4",3/16",5/32",1/8",7/32",5/16",7/8",1"GradeG100,G200,G500,G1000,G2000HRC58-62hrcQuality ... in all those applications which do not require the use of through hardened balls2,the most common applications include ... DAO/TIANJIN/output per yearmore than 5000ton/year 1/4 inch steel ball for bicycle spare parts