This set offers a variety of driver bits for everyday use as well as rare applications. Made of premium-grade S2 tool steel, these bits are heavy-duty, designed for hard use.Premium-grade S2 tool steelDriving bits designed for quick-change applicationsMultiple quantities of the most commonly used sizesMagnetic drive guide helps reduce slipping and wobble by holding long fasteners in place while the sleeve retracts as the screw is driven into the material