_{Surface treatment: self-color, zinc-plating (blue or yellow), hot dip galvanizing, mechanical deposit, black or according to the clients request Materials: carbon steel, middle carbon steel, C1045, stainless steel, brass, malleable iron or according to the clients request. Classificatory: stamped parts, steel washers, hardened washers, clamps(single-ring or double-ring), nails , bolts and nuts.}