Magnetic-Bit-Holder-Finder-Guide-76-115mm-Faithfull-FAISBMBHFIND-p-The-Faithfull-Magnetic-Bit-Holder-Finder-amp-Guide-is-designed-for-use-with-standard-1-4-Hex-shank-screwdriver-bits-and-can-be-used-with-any-variable-speed-drill-or-cordless-screwdriver-p-p-The-outer-sleeve-or-finder-slides-over-the-screw-head-and-helps-keep-the-bit-in-place-This-is-especially-useful-when-driving-or-removing-slotted-screws-The-combination-of-both-the-outer-finder-and-a-magnet-holds-the-screw-firml