1”Air Impact Wrench NO.:AE-320-01B2 Squire drive: 1" Free speed:3900r.p.m Bolt capacity:30mm Max torque:1800 N.m(1327ft-Ib) Hammer mechanism :Twin hammer Air inlet:1/2" Air pressure:6-8kg/cmZ Anvil length:2" Moment bound:500-1600 N.m