Slotted Head Driver Power Bits are made from S2 modified shock resistant steel for professional performance and durability. Proprietary precision CNC machined tips for excellent fit in fastener recess. Durable high-quality bits that last, will not strip out fasteners during proper installation. Fits a standard 1/4" quick change bit holder. Used to install fasteners with slotted drives, each bit has a range of sizes it can support allowing a single bit to be used for multiple sizes.