... 50.8mm 4.Hardness:HRC58-62 AISI1010,AISI1015,AISI1045,AISI1086 high precision Carbon Steel ball 1.Materials:(AISI E52100,100Cr6,SUJ2)+( ... waterproof)(2),put the ball carton into the pallet ,and fix the pallet.(3),Hooping the pallet tightly using the ... products are widely used in aviation industry,automobile industry,precision instrument,measuring appliance, motorcycle, bicycle,bearing,medical instrument ...