1) Made of AISI 420

2) Size: 0.5mm-25.4mm

3) Different grades: G20 G40, G100, G500, G1000.

4) Certificate: ISO-9002, TS-16949

5) Hardness: Over HRC 52.

6) Applied in all kinds of exactitude machines, bearings, ball screws, linear motion guides, automobile parts, chemical and food processing,

7) This steel ball is a common stainless steel ball.  It has general rust resistance, better hardness, and reasonable price.