1/2" Aeropro Square Drive Impact Wrench Set - AP17808 Hammer mechanism has 2 identical hammers that deliver an instantaneous balanced blow, reducing vibration and transferring more torque to the drive than any other mechanism on the market. Provides more power and smooth balanced blows. Screened filter air inlet keeps dirt and debris from damaging the tool. Twin hammer. Rear exhaust. Recommended air pressure 90 psi • Contents: • 1 Piece AP17407 1/2" Impact Wrench 10 Pieces Impact Sockets (9, 10, 11, 13, 14, 17, 19, 22, 24, 27mm) 1 Piece 5" Extension Bar 1 Piece Oil Pot 1 Piece Hex Wrench 1 Piece Mini Oiler 1 Piece Nipple 1 Piece Blow Moulded Case