... head and sizes finish:nickel plated,zinc plated with or without hardend wood screw with all kinds of head and sizescoach screws,fasterner ... Head Lag Screws 1.finish:nickel plated,zinc plated,2. with or without hardend3. head type: CSK(FLAT) SLOTTED HEAD OVAL ... ,M10,M12,M14,M16,M18,M20,M22,M24,M27,M30 wood screw with all kinds of head and sizes