... ) OEM/ODM is available. 2) Small order is acceptable. ProductHinge Pin Materialsteel, stainless steel, Invar, carbon steel, free cutting steel, aluminum ... , Hard AnodizePlate - Zinc plating, Yellow Zinc, Nickel plating, Silver plating, Tin plating, Chrome plating, Electroless-Nickel platingOxide - Black oxideBlasting - Sand blastingPainting ...