Magnetic Screw Guides are Designed to hold extra long fasteners in place, for more efficient hands-free fixingRare earth magnet is 4 times stronger than standard magnetsMagnetic tip increases productivity and eliminates frustration when working at awkward angles or in tight spacesRetractable sleeve holds the fastener securely and retracts as the fastener is driven into the workpiece1/4" hex shank with power groove for use in power tools and quick change adaptersTough grade high-alloy Chrome Vanadium steel absorbs shock and offers superior performance.