Allgrip Coach Screw M10 x 150mm, Hex Head, BZP, supplied in a box of 25.
Coach screws are a heavy gauge timber screw with a hex head for spanner or socket driving and a coarse thread for a strong grip in wood. Used for structural timber fixing: sleepers, gate posts, joist hangers and heavy brackets.
Pre-drill a pilot hole to avoid splitting and to make driving easier.