Pack of 10 2/4/6" Magnetic Bit Extension Holder Quick Change 1/4" Hex Shank for Power Drill Pack of 10 - extension magnetic bit holder Size included: 2" (4pcs), 4" (4pcs) and 6" 2 (Pcs) 1/4" hex shank fits all power drill/ impact driver and hand held driver Material : Chrome Vanadium steel Cr-V/ steel w/ chrome plate Quick Release 1/4" Hex Shank