made of a-101(Fe-Cr-Ni-B+Carbide), high quality wear proof ISO9001/2000 and CE Cert qualified

1.The "∞"  shape hole is lined with wearing proof alloy a-101(Fe-Cr-Ni-B+Carbide),hardness:HRC60-64.

2. high quality and wear-proof

C shape alloy bush for twin screw plastic extruder