The Blue-point brand Butterfly Throttle Air Impact Wrench from Snap-on Tools Company delivers 75 percent more torque than previous models through a lightweight aluminum housing, fitted with a compact air inlet swivel. The compact design and high power of the 3/8-inch, square-drive pneumatic wrench make it ideal for driving and loosening threaded fasteners. The AT351 Air Impact Wrench also accommodates extension bars, universal joints and socket adapters to offer versatility for a variety of applications.