a super fast & easy way to remove socket head screws with damaged heads no power, no drilling and no hammer required to get a damaged screw out - just press the extractor bit firmly into the ruined hex screw head & twist it out the sharp and fine-pitch spiral tip 'grips' all 6 sides of a hex socket firmly without slippage target screw type: Hex socket (Allen) cap bolts, hex countersunk or hex button head. Across flats: 2mm, 2.5~3.0mm, 4mm & 5mm (see photo gallery for more information) Other screw head types such as Phillips, Torx, square socket can be extracted if an electric drill is used to drill a pilot hole in the screw head first, Weight: 0.56438339072 pounds, Manufacturer: ENGINEER