Meterials: carbon steel, stainless steel, metal, brass, copper, zinc alloy, cold rolled steel with various plating Specification:1) Meterials: carbon steel, stainless steel, metal, brass, copper, zinc alloy, cold rolled steel with various plating 2) Head style: pan, round, flat, oval, truss, hexagon flange, bugle, wafer, hinge, binding, button, truss3) Surface treatment: kinds of plating (Zinc, ...