In-Dex Timber Framing Screws Designed as an alternative to the traditional Coach screws mainly used for timber to timber applications. Coated with a patented multi-layer corrosion resistant plating this screw is ideal for outdoor applications. Also available with a wafer head for improved clamping or a low profile finish. Hex Head 8mm hex head countersunk with a fixed washer. 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.