1) Size: 0.5mm-250mm( according to clients' requirement ) 2) Hardness: G10-G100 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. If you are interested in our product, please sent us an E-mail or fax in details which include diameter, tolerance, grade, quantities etc. So we can supply you a favorable quotation. E-mail:order@chnsteelball.com