... .5-50.8mm 3.grade: G100-G1000 58-62 HRC CARBON STEEL BALLS WITH GOOD SERVICE 1.best quality 2.competitive ... manufacturer in shan dong province,we are specialzing in making carbon steel balls(AISI1010,1015,1045,1085),chrome steel balls(AISI52100 ... are widely used in many fields such as auto,motorcycle,bicycle,bearings,aviation and precision instrument and medical instrument and etc ...