Irwin POWER-GRIP 53604 Screw Extractor, ST-4 Extractor, 1/2 to 9/16 in, 1/4 in NPT, 12 to 14 mm, 1/4 in BSP Bolt/Screw

Made from rugged, high carbon steel for use in soft materials or thin-walled pieces such as pipe and fittings. Able to remove left-hand bolts as well as right-hand bolts. Extractor size and recommended drill bit size are etched on each tool for easy identification.