... you all kinds of gears (spur gear, bevel gear, spiral gear, internal gear, sprocket, chain wheel) transmission, reducer ... light vehicle transmissions, auto parts, construction equipment, machine tools, conveyors, material handling, multi-spindle drives ... black of oxidation, zincing9) Machine: CNC engine lathe, milling machine, drilling machine, hobbing machine, grinder, gear shaper, testing center.10) ...