Designed as an alternative to the traditional coach screw mainly used for timber to timber applications. Coated with a patented multi-layer corrosion resistant plating to withstand 1,000 hours salt spray test, this screw is ideal for external applications. Hex head countersunk with a fixed washer Long lasting plating withstands up to 1,000 hours salt spray resistance in accordance to BS EN 9227:2012 Patented lubrication, designed to enhance screw insertion time and provides greater resistance to corrosion Helix shank for removing debris and to improve clamping 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 25 sharp point and single lead for a fast start and improved thread acceptance" Thread Dia. mm: 6.7 Length mm: 250 Thread Length mm: 52 Head Type: Hex Flange Recess Type: External Hex Point Type: 25 Sharp with Single Slash Socket Size mm: 8 Finish: Exterior (Green Organic) Material: Carbon SteelSize 6.7 x 250 - 50 Pieces Timco Timber Frame Construction & Landscaping Screws - Hex - Exterior in Green