1”Air Impact Wrench NO.:AE-45001B2 Squire drive:1" Free speed:3900r.p.m Bolt capacity:38mm Max torque:2200 N.m(1623ft-Ib) Hammer mechanism :Pinless hammer Air inlet:1/2" Air pressure:8-10kg/cmz Anvil length:9" Moment bound:1200-2000 N.m