... drilling 1.Material:steel,stainless steel,iron, plastic,aluminum,bronze,brass etc.2.Equipments:cnc engine lathe, milling machine, drilling ... machine,hobbing machine, grinder, gear shaper3.Surface treatment:galvanization,chromeplate,blackening etc4.Quality control:PDCA ... welcome to get a quick offer,Samples are free. Plastic Spur Gear for Reduction Machine