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. They 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 zinc yellow passivated finish for excellent resistance to corrosion. Zinc yellow passivation process of electroplating is similar to the 'galvanised' and 'zinc plated' processes, with the addition of a yellow dye. It offers an aesthetically pleasing finish. CE approved for use in load-bearing timber construction. The tough compartment case contains: 75 x Spectre™ PZ Compatible Wood Screws 3.5 x 20mm. 75 x Spectre™ PZ Compatible Wood Screws 3.5 x 25mm. 75 x Spectre™ PZ Compatible Wood Screws 3.5 x 40mm. 75 x Spectre™ PZ Compatible Wood Screws 3.5 x 50mm. 150 x Spectre™ PZ Compatible Wood Screws 4.0 x 25mm. 150 x Spectre™ PZ Compatible Wood Screws 4.0 x 30mm. 150 x Spectre™ PZ Compatible Wood Screws 4.0 x 40mm. 150 x Spectre™ PZ Compatible Wood Screws 4.0 x 50mm. 100 x Spectre™ PZ Compatible Wood Screws 4.0 x 70mm. 50 x Spectre™ PZ Compatible Wood Screws 5.0 x 50mm. 50 x Spectre™ PZ Compatible Wood Screws 5.0 x 80mm. 50 x Spectre™ PZ Compatible Wood Screws 5.0 x 90mm. 50 x Spectre™ PZ Compatible Wood Screws 5.0 x 100mm.