Uxcell a14121800ux0193 9 Piece Magnetic Nut Driver Set 8mm 5/16" Socket Adapter Hex Drill Bit Product Name : magnetic nut setter;material : chrome vanadium steel Hex size : socket: 8mm / 5/16"shank: 6mm / 1/4";overall size : 40 x 12mm / 1.6" x 0.47" (l*max.D) Color : Gray Weight : 147G Package Content : 9 x magnetic nut setter