... -65HRC 3.size:1/4" 4.Grade:G500/G1000 ISO qulified company Production name1/4 inch steel ball for bicycle spare partssize1/4",3/16",5/32",1/8 ... ",7/32",5/16",7/8",1"GradeG100,G200 ... of loadingQING DAO/TIANJIN/output per yearmore than 5000ton/year 1/4 inch steel ball for bicycle spare parts