Forgefix Spectre™ Advanced Deck PZ Compatible Screw CSK Green 4.5 x 50mm Tub 1000Spectre Advanced Deck & Outdoor Screws feature a countersunk, pozidrive compatible, recessed head. They have a green coated finish for excellent resistance to corrosion. These screws have a sawtooth thread, to prevent splitting, reamer to prevent jacking, and are also surface hardened with a quick start type 17 slash point. CE approved for use in load bearing timber construction. Spectre Advanced Deck PZ Compatible Screw CSK Green. Specifications;