WAFER HEAD LANDSCAPE WOOD TIMBER FIX SCREWS SLEEPER DECKING INDEX JOINING 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, this screw is ideal for outdoor applications. Wafer Head Torx Head TIM Drive recess provides excellent drive. Wafer head for a secure clamping. Helix & Thread Helix to remove debris and a 50° deep single thread to provide secure fixing with high pull-out resistance. Type 17 Slash The Type 17 Slash to reduce torque and the likelihood of the timber splitting when the screw is inserted close to the edge.