The Bosch 2608577147 is a 35-Piece Drill and Screwdriver Bit Set with HEX-9 MultiConstruction Drill Bits and Universal Holder Quick Release. There are 8 Drills ranging in size from 3 - 8mm. The Pick and Click Impact Control Screwdriver Bit Set is a customisable set containing highly robust bits that are ideal for heavy duty applications, even withstanding the high power of impact drivers. The bits feature an extended torsion zone making 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. Featuring a 1/4-inch external hex shank for use with drill drivers, screwdrivers, and especially with impact drivers. 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.