Tackle heavy-duty fastening tasks with confidence using the Dewalt DT7399T-QZ screwdriver bit set. Designed for impact drivers with a standard 1/4" hex shank, these 50 mm bits feature an engineered torsion zone that absorbs severe torque peaks, preventing premature tip breakage during tough timber and metal applications. The precisely machined Torx T40 profile provides a snug fit in the screw head to eliminate slipping, cam-out, and wobble. Supplied in a practical pack of 5 pieces, these durable bits deliver the performance and extended lifespan needed on demanding jobsites.