Feature:

1) Material:45# steel,16 # Mn,A3 steel

2) Specification:415,420,428,428H,520..etc

3) Front gear:13T,14T,15T,16T,17T..etc

4) Rear gear:34T,35T,36T,37T,38T,57T..etc 

5) Heat treatment:High frenquency quenching,Carburization

6) Surface treatment:Sandblasting,Galvanized,Cr-plating..etc