... 8mm 4.Hardness:HRC58-62 AISI1010,AISI1015,AISI1045,AISI1086 high precision Carbon Steel ball 1.Materials:(AISI E52100,100Cr6,SUJ2)+(100CrMn6 ... /4",3/16",5/16",5/32",3/8"4, ISO9001-20085.Delivery time : 15days .6.Packing : We pack our ... .Our products are widely used in aviation industry,automobile industry,precision instrument,measuring appliance, motorcycle, bicycle,bearing,medical instrument and food ...