1)High precision, strong hardness2)strong antiwear 3) use high-speed and low-noise bearing, bicycle, motorcycle, ... 05mm-250mmMaterialsGCr15HardnessHRC58--66ApplicationAuto industry , Wind Power , Slewing bearing , Tower crane,Marine Machinery, Aerospace Industry , ... (3/4”-10”) steel ball and (3/4”-5”) stainless steel ball.We can accept ... ≤0.25 high precision durable GCr15 steel ball/bearing steel ball