Ideal for pressure treated timber, decking, fencing, sheds. Features Net-Coat treated corrosion protection for high corrosion resistance and minimum timber damage on insertion. Awarded the TDA's DeckMark accreditation. These screws are CPT-hardened to offer the strength of a high-tensile bolt and help prevent breakages. A Tri-Lock gives three flats on the thread, preventing loosening by initially expanding the wood which then relaxes back around the screw to lock it in position. The coarse single thread clamps timbers fast, with a high pull-out retention for a solid fix. Net-Coat protection helps withstand the elements, working against the chemicals in treated timber to combat galvanic corrosion. Perfect for use with decking, fencing and sheds, and ideal for use with pressure-treated timbers. They offer long-lasting security, won't unscrew over time, and have TDCA DeckMark+ status for quality and performance. The unique thread pitch to core size ratio gives the perfect balance between ease of insertion and pull-out retention whilst increasing the core sheer strength. The Tri-Lock thread forms, not cuts, a thread in the material, expanding the wood which then relaxes back around the screw ensuring a tight and locked fix. Once driven in the screw will not move, it is secure for good. Spiral point for immediate start, no pilot hole required. Permeated case with through hardening allows the perfect balance between core ductility and surface toughness with the strength of a high tensile bolt, the screw will not snap. Part thread eliminates jacking where a full threaded screw tends to pull apart the jointed material. Collar gives strength to the most vulnerable point of the screw, whilst allowing a deeper recess and less cam-out for a secure drive. Three flats on the thread means that as the screw is driven there is less surface contact between the screw and timber allowing less battery wear, easier insertion and the screw will not work loose as the boards are walked upon. Net-Coat Green is developed for new pressure treated timber and outdoor use.