1. the material can be 20CrMnTi, 16MnCr5, 40#,45#, 40Cr, 42CrMo etc ... quench We can supply:1. gear modul 0-6;2. the gear quality can be ISO 5,6,7,8 grade ... ;3. the material can be carbon steel, nylon, plastic;4. the heat treatment can be case hardening ... of the production line is also advance in China;6. the products are widely used in auto, tractor, truck, lift machine and precision machine ...