... . 3. Material: Carbon steel, stainless steel, plasitc, aluminium alloy, bronze, brass. 4. Surface treatment: Carburizing, hardening and tempering, nitriding, ... engine lathe, milling machine, drilling mchine, hobbing machine, grinder, gear shaper. 6. Small order acceptable. 7. Packing: Wooden or ... ensure the quality for you.if you have need,pls be free to contact with us Worm Gear Processed by CNC ...