... .Surface treatment:Zinc plated High quality cnc machining zinc plated steel spur gear Our Advantages :Over 12 years experienceHigh quality control ... range: 510mm*1020mm*500mm Our OEM Serivce : 1) Material:Steel, Brass, Copper, Stainless steel, Plastic, Aluminium POM, Delrin, Titanium Alloy etc.2 ...