From the manufacturer Timber Wolf Multi-Purpose Wood Screws High Performance Wood Screws Timber Wolf multi-purpose wood screws feature the patented HEXSTIX drive system. This system enables smooth, stable driving and one-handed installation, thanks to Stick-Fit technology. Driver Bit Included in Every Box Every box of Timber Wolf woodscrews contains a high-quality impact style driver bit. When used with the Timber Wolf woodscrews this ensures maximum drive performance. What if I lose my driver bit? Timber Wolf screws are 100% compatible with standard torx/star style driver bits and screwdrivers. Use size T20 for 4.0mm diameter screws, and size T25 for 5.0 & 6.0 diameter screws. Design Features For Real World Benefits A Type-17 ‘slash’ point drives the screws through the hardest timbers. Prominent threads give rapid start-up and strong holding power. Premium wax lubricated finish for rapid, low torque insertion. Serrated threads prevent pressure build up in order to reduce wood splitting. Thick core design for added strength. A double angle countersunk head with ribs gives a neat finish every time. Features & Benefits Patented Stick-Fit drive system for smooth, stable driving and one-handed installation High quality Stick-Fit driver bit included in every box Can be used with standard Torx/Star style driver bits and screwdrivers High strength design and construction Double angle countersunk head with ribs for a neat finish Suitable for use in hardwood, softwood, man-made timbers, and sheet metal Waxed finish for low torque insertion Type-17 ‘Slash’ point to drive through the hardest of timbers