Irwin Tools 53902 Accessories, Impact Bolt Grip 5/16"/8mm 3/8 Dr Bolt extractor is built for maximum durability and long life with impact drivers High-carbon steel helps ensure long bolt extractor life and great durability Universal lobular design fits most types of fasteners Reverse spiral flutes are engineered to provide maximum gripping power to easily remove broken, damaged or rusted nuts, bolts and screws Black oxide finish resists corrosion and increases the life of the bolt extractor