IRWIN Tools 2-1/2 Inch Speedbor Lock N' Load Quick Change Bit Holder (4935703) Carbon steel construction sleeve and body for durability and life Designed for one-handed quick release The patented jaw design holds bits securely on 6-flatted shanks, as well as ball detent bits The 1/4-Inch quick change range now holds insert bits and uses magnets for holding the bits Used for Spade Bits, Fastener Drive, Speedbor Max, Small Size Unibits