Uxcell Magnetic 8mm Hex Socket Nut Driver 1/4-inch Quick C Product Name : Hex Driver Bit; Material : Chrome-Vanadium Hex Socket Size : 8mm/ 5/16"; Hex Shank Size : 6.35mm/ 1/4" Overall Size : 12 x 41mm/ 0.47 x 1.6" (DL); Color : Gray Weight : 167g Package : 10 x Hex Driver Bits