Designed as an alternative to the traditional coach screw. This heavy duty screw dramatically decreases installation time as it doesnt require a pilot hole into most wood types. This screw is ideal for external applications or where extra strength is required. Coated with a patented multi-layer corrosion resistant plating to withstand 1,000 hours salt spray test. Hex head countersunk with a fixed washer Patented silver corrosion resistant plating 50 deep single thread to provide a secure fixing with high pull-out resistance Single slash point to reduce torque and the risk of timber splitting at low edge distance Helix removes debris and helps improve clamping" Thread Dia. mm: 10.0 Length mm: 160 Thread Length mm: 60 Head Type: Hex Flange Recess Type: External Hex Point Type: 25 Sharp with Single Slash Socket Size mm: 13 Finish: Exterior (Silver Organic) Material: Carbon SteelSize 10 x 160 - 10 Pieces Timco Heavy Duty Timber Screws - Hex - Exterior - Silver