... (spur gear, bevel gear, sprial gear, internal gear, sprocket, chain wheel) transmission, reducer ,shaft and sleeve etc. They are of good ... tempering, 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 Gear Wheel OEM