32029 Pneumatic Bolt Breaker Set, 37315 3/8" & 37316 1/2" Shake 'n Break Pneumatic Bolt Breaker Set, 2-Piece, helps remove seized and frozen bolts and nuts. Our Pneumatic Bolt Breaker Set is designed for ease of use. It is to be used with a wrench, aiding the rotation and loosening of seized fasteners. The standard .401 Turn Type Parker Shanks for air guns make it a user-friendly tool. The end of each bolt breaker has either a 1/2 or 3/8-inch square drive for use with impact sockets. The built-in hex (19mm—3/4-inch) on the tool shaft uses an open-end wrench to loosen a stubborn fastener. Applications include bearing removal and GM caliper removal. An air hammer provides vibration while removing stubborn/frozen fasteners or Torx bolts/nuts. The other end of each bolt breaker has either a 1/2-inch or 3/8-inch square drive for use with impact sockets. Superior 24-hour customer service - No matter your problem, we're here to help and answer your questions.