xTIMco In-Dex Timber screws are designed for decking, stairs, fencing, roofing and landscaping. Available with a 8mm hex head countersunk with a fixed washer. Plated in Olive green to with stand up to 1,000 hours (min) salt spray resistance. They have a 50 degree deep single thread to provide secure fixing with a high pull-out resistance and a type 17 slash to reduce torque and the likelihood of the timber from splitting when the screw is inserted close to the edge. And they have a 25 degree sharp point for easier penetration into all wood types.