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With the Bosch 2607001733 Extra Hard screwdriver bits, you can tackle fastening tasks quickly, accurately, and without damaging screw heads. Crafted from heat-treated S2 modified steel with a tapered torsion zone, these hex 4 mm bits easily cushion high torque peaks, preventing premature breakage and stripping. Their 49 mm length gives you the extra reach needed for recessed hex socket screws during furniture assembly, machine construction, or bicycle maintenance. The standard 1/4" external hex shank ensures direct torque transfer and fast bit changes in your drill driver or screwdriver. This practical pack of 3 bits delivers the durability and reliability you need for daily jobs.