Countersunk head. Reinforced countersunk head handles torque & harder woods. Self countersinking ribs under the head are time saving & ensure a neat finish. Classic pozi drive. Shank ribs. These reduce the drive torque required during installation. Helps prevent the wood splitting, particularly useful on the longer lengths & larger diameters. Cleans the hole when securing two pieces of wood together preventing jacking. Special thread geometry. The special thread design with advanced cutting edge combined with a next generation lubrication system ensures almost half the torque is required to drive in. Faster, with less effort. Zinc & yellow finish. Cut point. The type 17 or “gash” point, helps drive the screw through the tougher woods without pre-drilling. 1 Pozi Driver Bit supplied in every box