Uxcell a11030800ux0455 Magnetic 8mm Hex Nut Driver Bit 1/4" Shank Spanner (2 Piece) Product Name : magnetic hex driver bit; hex socket size : 8mm/ 5/16" Hex shank size : 6.3mm/ 1/4"; overall size : 13 x 65.5mm/ 0.5" x 2.6" (d*l) Color : as Picture shown; material : metal Weight : 67G Package : 2 x magnetic hex driver bit