... of gears(spur gear, bevel gear, sprial gear, internal gear, sprocket, chain wheel) transmission, reducer ,shaft and sleeve etc. They are ... , Nitriding, high frequency treatment, black of oxidation, zincing9) Machine: CNC engine lathe, milling machine, drilling machine, hobbing machine, grinder, gear ... prime quality & best service & timely shipments12) Accept trial order OEM Sprocket Wheel Gear