1" DR. Impact Wrench 1" DR. impact wrench Nickel chrome molybdenum square driver Variable speed trigger Muffled on handle exhaust 6" extension anvil are available General specification Std. Bolt Size : 1-27/64" inch / M36 Overall Length : 20-5/64" inch (510 mm) Air hose : 3/4" ID Avg. Air Consumption : 255L/min 9.0 CFM Sound : 101.56DBA Vib : 4.37m/s²