Material:AISI52100 Features: 1.Size: 0.5mm-250mm( according to clients' requirement ) 2.Hardness: G5-G100 3.Certificate:ISO-9001, ISO-14001, 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.