3/4" Air Impact Wrench, Heavy Duty, 1100 ft-lb Torque, Thru-hole Retainer, Pistol. The 1720 Series Impact Wrench features a jumbo hammer impact mechanism with an optimized power-to-weight ratio. Paired with its steel hammer case and metal housing, this tool is ready for even the toughest jobs. Different Trigger Styles Available: Featuring both trigger and butterfly actuation, this tool is ready for anything. Durability: Ingersoll Rand has built the 1720 Series Impact Wrench to last. Even through frequent dropping and harsh environments, this tool is reliable from its first use to its last.