Splits most stubborn nuts 7/16_ (11mm) through 3/4_ (19mm) across the flats.Works in channels not accessible to other tools. Parallel action of pusher cracks nuts without damaging bolt threads. Chisel rotates 360¡ to line up parallel to bolt. Simply tighten the screw until the nut splits. Has rugged drop-forged frame. Do not use on heat-treated nuts. Length: 6-3/4_. This is a serviceable product.