The Conduit Locknut and Reaming Pliers tighten up to 3/4-inch EMT and 1/2-inch rigid locknuts. The special jaw is designed for locknuts, conduit and caps. Serrated jaws deburr the outside while the nose reams and smooths the inside of conduit up to 3/4-inch EMT. The long-nose design makes it easier to reach into electrical boxes.