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These T25 Draper TX-STAR® impact screwdriver bits are made from S2 steel, which is correctly hardened and tempered for durability and long life. Each has a blackened 1/4" hex shank with a shot blast finish and precision ground tips to prevent cam out and screw damage. Specifically designed for use with an impact driver The shock absorbing torsion design increases torque performance Precision ground tips prevent cam out and screw damage Made from S2 steel for durability and long life Supplied in a robust plastic case Draper TX-STAR® products are compatible with Torx fixing systems.