1/2”Air Impact Wrench NO.:AE-12A01B2 Squire drive:1/2" Free speed:8000r.p.m Bolt capacity: 16mm Max torque: 660 N.m(486ft-Ib) Hammer mechanism:twin hammer Air inlet: 1/4" Air pressure: 6-8kg/cm2 Anvil length: 1” Moment bound: 200-500 N.m