1.Material:Gcr15 high carbon chrome bearing steel (AISI 52100)
2.Grade: G10
3.Size:2.0mm,2.381mm(3/32"),3.175mm(1/8"),3.5mm,3.969(5/32"),4.763mm(3/16"), 5.953mm(15/64"),6.35(1/4") Gauge: ±12 Subgauge:±0.4
4.the main steps to produce the ball: heading,polishing,heat treament,grinding,lapping,packing
5.the product is: possible hardness, technical characteristics,perfectly shiny, compact and defect-free surface,low noise
6.HRC: 62-66 7.Noise: 26-30db 8.VDWS:bellow 0.15um 9.Ra: 0.011-0.015um
VDWL: bellow 0.20um