Forgefix decking screw pozi st green anti corrosion forgefix ds4550 these forgefix single threaded decking screws have pozidriv heads and are specially designed hardened and green treated the design of the screw helps prevent splitting the boards and allowing them to expand and contract with the changing seasons forgefix ds4550 decking screw pz st green anti corrosion 45 x 50mm box 200