Also called a "Screw Knocker", "Woodpecker", or "Nut Buster", this tool is used to remove screws, bolts, nuts, etc. that are corroded or cannot be loosened by conventional methods. Fits all rivet guns with a .401 Parker Taper shank. Accepts 3/8" square drive sockets and tooling. Drop forged from tool grade steel and hardened to 45 Rockwell. See p/n AT54K for optional 1/4" adapter and drive bits. 10" long.