The impact Control screwdriver bit Set, 36-piece, is highly robust for heavy-duty applications. The screwdriver bits and nutsetters feature an extended Torsion zone that makes them extremely sturdy for long-lasting work. S2 modified steel and an optimised heat-treatment process provide extra-tough endurance for high performance, including in 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.