1) Materials: AISI440C,AISI420C,AISI304C,AISI316C,AISI52100&GCr15, 2) Size:0.8mm-25.4mm 3) Grades:G3,G5,G10 Product use:Mount tai steel ... aviation industry use and several the demand of the market:1.High speed, low noise special bearings2.Different specifications with stainless ... set with the ball5.Liquid, gas with ball valve, etc 25.4mm steel balls