The Impact Control Screwdriver Bit Set, 31-Piece, is highly robust and even withstands the high power of impact drivers. Its extended torsion zone makes the bit extremely sturdy for long-lasting work, while S2 Modified Steel and an optimised heat-treatment process provide extra-tough endurance for high performance. This bit is perfect for heavy-duty applications such as plant installations or heavy industrial work. All bits have a 1/4-inch external hex shank for use with drill drivers, screwdrivers and especially with impact drivers. This set provides the option to easily remove and replace packs of the included assortment with alternatively purchased bit packs for the variation of customised set contents. New bit packs can be easily clicked into the set.