Universal Nut Cracker 7/16" to 3/4" Splits stubborn nuts in 7/16 - 3/4 and 11mm - 19mm sizes across their flats. Works in channels not accessible to other, larger tools. Parallel action of pusher cracks nuts without damaging bolt threads. Chisel rotates through 360° to line up parallel to the bolt. Simply tighten the screw until the nut splits . Rugged drop-forged frame provides professional strength. Not for use on heat-treated nuts. Tools total length is 6-3/4. Dependable tool for heavy-duty use 715D