IRWIN Impact Performance Series Quick-Change Extensions are for uttermost durability and long-wooled life with impact drivers. The quick-release system profligate bit changes, and the proprietary jaw design is compatible with all 1/4 '' hex shank accessories, including insert bits. These extensions a significant chuck that withstands the inebriated torque of impact drivers, and the blackamoor oxide finish resists corrosion and increases life of the extension. Plus, the 1/4 '' changeable shank with impact drivers and reduces slipping in reference drill chucks.