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 Holder Quick Release offers easy bit changes and extra-firm bit hold in universal screwdriving applications. A permanent magnet ensures a firm and secure grip of the bits in use, while its Quick Release function on the chuck enables fast and easy bit changes and further supports the strong bit hold. It is excellent for all fixing jobs requiring power tools. The set is part of the Bosch Pick and Click system, which enables individually buildable accessory sets for fully customisable bit collections. Click-fitting slots perfectly secure individually purchased packs for a personalised collection and the easy replacement of old packs. All bits have a 1/4-inch external hex shank and are suitable for use with drill drivers, screwdrivers, and especially with impact drivers.