General description A traditional heavy-duty woodscrew, the TIMCO Coach Screws Hex Head Silver is primarily designed for timber-to-timber applications. It is also suitable for attaching ironmongery to timber or into masonry when used with a nylon plug. Technical specifications Dimensions: 10.0 x 160 mm Thread length: 2/3 of the overall length Installation Pilot drill holes may be required for certain hardwoods.