Seamless Bearing Steel Tubes outside Diameter: 5mm to 100mm, Wall Thickness: 1mm - 25mmstandard: DIN 17230,ASTM A295,ASTM A534,JIS G 4805 Steel Material: 100Cr6,GCr15,52100,5195,509OM,107OM,516O,4118H,4320H.4620H.SUJ1,SUJ 2,SUJ3,SUJ4,SUJ5) Application: Used for Bearing Ring and Bearing Tubes.