3/4”Air Impact Wrench NO.:AE-34A01B2 Squire drive:3/4" Free speed:4200r.p.m Bolt capacity:30mm Max torque:1600 N.m(1180ft-Ib) Hammer mechanism:Twin hammer Air inlet:3/8" Air pressure:6-8kg/cm2 Anvil length:2" Moment bound:500-1300 N.m