Spectre™ PZ Compatible Advance Multi-purpose Screw 3.5x16mm - ForgeFix SPE3525BL, Forgefix Spectre™ Advance Multi-purpose Wood Screws feature a countersunk, Pozidrive compatible, recessed head. Fully threaded, up to 50mm, with a sawtooth thread, to prevent splitting and reamer to prevent jacking (50mm and above). They are also surface hardened with a quick start type 17 slash point. The screws have a black coated finish for excellent resistance to corrosion. Spectre™ by Forgefix incorporates a long list of advanced screw features, often only found in premium screws, into what we've named advanced multi-purpose wood screws.CE approved for use in load-bearing timber construction. ForgeFix SPE3525BL Spectre™ PZ Compatible Advance Multi-purpose Screw 3.5x25mm