1) Size: 0.5mm-250mm( according to clients' requirement ) 2) Grade: G5-G100 3) Hardness: HRC62-65. 3) Certificate: ISO-9002,TS-16949 4) Feature: Good wearing, excellent surface quality and high hardness. 5) Application: Bearing, ball screw, linear motion guide, automotive parts, chemical, food processing, ink and paint grinding, caster wheel, slide rail bicycle and car.