The Mayhew Tools 37315 Pneumatic Bolt Breaker, 3/8-Inch attaches to an air hammer to provide vibration while removing stubborn/frozen fasteners or torx bolts/nuts. The other end of the bolt breaker features a square drive to be used with impact sockets. Made in the USA. Overall length: 4.750-Inch, body size: 0. 401-Inch, weight: 0. 33-Lb. Mayhew stands for quality, dependability, and confidence. When the caliber of the tools is just as important as the skills of the professionals employed, businesses trust Mayhew to get the job done. Since 1856, our punches, chisels, and pry bars have been the go-to tools for OEMs and professional mechanics throughout the country. And while our company has grown to meet the needs of the professional market, as well as those of the do-it-yourself automotive enthusiast, our focus has never changed - leveraging our strength to build your business.