MaxFit Screwdriving Set (48-Piece) 48 piece screwdriving bit set and a 6" universal quick change extender Includes 47 1" & 2" bits, 1 Maxfit bit holder with magnetic sleeve, and a 6" bit extender. Part of 10X magnetic screw lock system. Fastener retention, minimized drops, and reduced wobbling. 6" hex shank bit extender takes the hassle out of reaching and drilling holes in wall studs. Quick change adapter fits all 1/4" hex shank bits.