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....