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. Complete kit includes Screw Knocker, 1/4" Hex Bit Adapter, plus an assortment of four 1/4" Hex Bits. 4" long.