The Bosch 13 Piece M Extra Hard Screwdriver Bit Set is a versatile collection of 25mm screwdriver bits designed for universal screw-driving across a wide range of professional tasks. Manufactured from S2 Modified Steel with an optimised heat treatment process, each bit in this set delivers extra-hard performance suitable for demanding day-to-day use. The material quality ensures consistent results whether working with a standard screwdriver or a drill driver. Each bit features a tapered torsion zone that absorbs torque peaks, force, and vibrations during screw-driving, helping to protect both the bit and the fastener under load. The 1/4-inch external hex shank provides a secure connection with maximum torque transmission in three-jaw chucks and 1/4-inch internal hex tool holders. The set covers the most commonly used drive types on site, including Phillips (PH1, PH2, PH3), Pozidriv (PZ1, PZ2, PZ3), and Torx (T10, T15, T20, T25, T30, T40), plus a quick-change universal holder — making it a practical all-round solution for contractors, carpenters, and general tradespeople. Features and Benefits: • S2 Modified Steel with optimised heat treatment for extra-hard, long-lasting performance • Tapered torsion zone absorbs torque peaks and vibrations to protect bits and fasteners • 1/4-inch hex shank compatible with three-jaw chucks and 1/4-inch internal hex holders • 13-piece set covering Phillips, Pozidriv, and Torx drive types for universal use Specifications: Bit Length: 25mm Net Weight: 0.137kg Set Size: 13 piece Contents: PH1, PH2, PH3, PZ1, PZ2, PZ3, T10, T15, T20, T25, T30, T40, Quick-Change Universal Holder