Use the pulsing of an air hammer along with the controlled turning of a hand wrench to release stuck fasteners without breaking them. These adapters give you better handling than an impact wrench plus more power than turning just by hand. Attach the square drive to your impact-rated socket and insert the round shank into the chuck of your air hammer. As you hammer, use a wrench to turn the hex portion of the adapter to control the socket. Adapters have a 0.401" round shank that fits the most common air hammers.