The Hex Drive Socket (MES5/16) is the perfect bit for driving in most things with a hex head whether its a nut, bolt, self-drilling screw or sheet metal screw. It has a magnet built-in which holds the fitting in place allowing for easier application. The nutsetter is made from toughened steel alloy for greater stability and strength. It has a 1/4" shank, fits a 5/16" hex nut and is 65mm total in length.