IRWIN® offers a full line of screwdriving bits designed for a number of applications. All bits are manufactured with industrial-grade S2 steel for long life and durability. Insert bits are engineered for use in hand-driving applications or with power tools when used with the IRWIN® insert bit holder. Power bits are specifically designed for the higher torque requirements of power tools. They are designed to provide more clearance between the power tool and the fastener.