Timber Screws - TX - Wafer - Exterior - Green are designed as an alternative to the traditional coach screw mainly used for timber-to-timber applications. Wafer head for improved clamping and a low profile finish. Coated with a patented multi-layer corrosion-resistant plating to withstand 1,000 hours salt spray test, this screw is ideal for external applications. Wafer head countersunk and TX30 recess 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