... .3mm to 200mm Grade:G10 to G1000 AISI52100 Bearing Steel Ball SpecificationMaterial:GCr15 bearing steelDia:0.3mm to 200mmGrade:G10,G16,G20 ... ,G40,G60,G100,G200,G500,G1000Application:high speed-low noise bearing,bicycle,motorcycle,automobile,rail,universal ball,bags,electronic industry,grinding ... :0.025%maxS:0.025%maxCr:1.3%-1.6% For more details,please feel free to contact me directly. Best ...