... : carbon steel, stainless steel, metal, brass, copper, zinc alloy, cold rolled steel with various plating 2) Head style: pan, round, flat, oval ... , bugle, wafer, hinge, binding, button, truss3) Surface treatment: kinds of plating (Zinc, Nikel, Chrome, Tin, Ag); Painting, Powder, Anodizing, E-coating, Silkscreen ... contact us. Stainless Steel screw brass standoff screw with threads blue zinc plated