1) Bore diameter from 3mm to 50mm
2) Gcr 15 (SAE52100)chrome steel
3)Hardness: HRC60-65
4)low noise and low vibration, long life, low price
5)Model available open, Z, ZZ, RZ, 2RZ, 2RS
6)ISO9001 certificate
7)Single color box or tube industrial packing
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