Customisable Set, Robust Bits - The Pick and Click MultiConstruction Drill and Impact Control Screwdriver Bit Set, 35-Pieces is a customisable set containing highly robust bits that are ideal for heavy duty applications. The screwdriver bits feature an extended torsion zone that makes them extremely sturdy for long-lasting work, even withstanding the high power of impact drivers. S2 Modified Steel and an optimised heat-treatment process provide extra-tough endurance for high performance, including in plant installations or heavy industrial work. Also included are HEX-9 MultiConstruction Drill Bits that are ideal for use in practically all kinds of materials in interior fitting work. They feature diamond-ground cutting edges for high wear resistance and a 2-flute U-shape that offers good dust removal and standard lifetime. Their carbide tip also provides an easy start and good control when drilling. All bits have a 1/4-inch external hex shank and are suitable for use with drill drivers,