... :Long hinges, piano hinges, car hinges, carriage hinges, stainless steel & iron hinges.2, Material:Stainless steel, copper, aluminum, iron3, Surface treatment:Electroplating: gold-plated, copper-plated, and ... , for example: piano up and down cross board hinges, long doors and accessorize box hinges, metal mail box hinges, vehicle doors hinges, and so on. Welcome to ...