The Pick and Click Impact Control HSS Twist Drill and 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 extended working times, 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 plant installations, industrial work and heavy duty drilling in metal. Equipped with an oxide-coated flute and precision-ground from solid metal, the Impact Control HSS Twist Drill Bits have an excellent surface quality for cutting through steel, metal and iron with reduced wear. The Impact Control Universal .