TRX tamper-proof countersunk machine screw

[Material] Stainless steel
[Surface treatment] None, non-chrome black, trivalent chromate, non-chrome plating white, trivalent black, trivalent white, bright chromate plating, chromate plating, black chromate, nickel plating, chrome plating, trivalent stainless steel coating, German brown plating, black paint, temper color (dark)