The Last Resort to Save a Rusty Bolt - This splitter features a drop-forged body and hardened cutter. Splits nuts from 9/16in. through 1-1/8in.. Imported. One-year manufacturer's warranty. The (43454) Universal Nut Splitter removes nuts from 7/16in. thru 3/4in.. Not for use on Hardened or Heat Treated Nuts. Wear Safety Goggles.