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Forged bit - reduces stripping, increases bit life and allows for a better fit. The forged bit lasts up to three times longer than a traditional bit. Bits are magnetic for ease of use with fasteners. Heavy duty cold forged steel - for higher torque output Hardened hex shank - for use in all drillsIrwin Torsion screwdriving bit delivers more torque because it is a better bit. Designed for superior fit and forged to withstand more load, the Torsion bit lasts up to three times longer than standard bits. The 6 piece set includes - Quick Change Adapter, 1 and 2 Phillips (2 each) Power Bits and the 1 and 2 Square Power Bits.