1) Materials: AISI440C,AISI420C,AISI304C,AISI316C,AISI52100&GCr15, 2) Size:0.8mm-25.4mm 3) Grades:G3,G5,G10 Product use: ... precision, low noise motor bearing, household appliances bearing4.And general industrial use and automobile, motorcycle, bicycle manufacturing special bearings of steel ... set with the ball5.Liquid, gas with ball valve, etc 7/8, 22.225mm carbon steel balls