Standards: GB, DIN, BS, ANSI, UIN, JIS and ISO, etc Materials: Carbon Steel (low, middle and high), Stainless Steel, Alloy Steel, Brass, Aluminum, Titanium, Nickel, Cobalt, Chromium, Nylon and PVC etc. Surface treatment: Zinc (black, white, blue, green, yellow, etc) plated with trivalent or hexavalent chromate, hot dip galvanized, nickel, chromate, gold, silver, copper, Dacrotized, Nylok, etc.