Product Description Features: 1) Made of AISI 420 2) Size:0.5mm-25.4mm 3) Different grades:G20 G40, G100, G500, G1000. 4) Certificate:ISO-9001, TS-16949 5) Hardness:Over HRC 52. 6) Applied in all kinds of exactitude machines, bearings, ball screws, linear motion guides, automobile parts, chemical...