The bosch expert tic tac box extra hard torx screwdriver bits are precision-engineered t20 screwdriver bits designed for universal screw-driving with screwdrivers and drill drivers. Manufactured from s2 modified steel with an optimised heat treatment process, these bits deliver extra-hard performance across a wide range of fastening tasks. This makes them a reliable choice for tradespeople and contractors who need consistent results under demanding conditions. The tapered torsion zone is a key design feature, absorbing torque peaks, force, and vibrations during screw-driving. This helps protect both the bit and the fastener, extending working life and reducing the likelihood of cam-out or bit failure mid-task. Each bit features a 1 4-inch external hex shank, ensuring a strong, secure connection with maximum torque transmission in three-jaw chucks and internal hex tool holders. Supplied in a convenient tic tac box for organised storage and easy site access. Features and benefits: s2 modified steel construction with optimised heat treatment for extra-hard durability tapered torsion zone absorbs torque peaks, force, and vibration during screw-driving 1 4 external hex shank for maximum torque transmission in three-jaw chucks and hex tool holders suitable for universal use with screwdrivers and drill drivers supplied in a tic tac box for convenient storage and site use specifications: drive type: torx t20 shank: 1 4 external hex length: 25mm weight: 0.141Kg