Impact wrench&air impact wrench&air tool&pneumatic wrench&professional impact wrench&air wrench 1/2 twin hammer Certificate: CE ISO9000/2000 No-load speed: 7000 r. P. M Max. Torque: 680 N-m Capacity bolt Dia: 18mm Air inlet: 1/4 inch Net weight: 2.9kg. Package: Color box 31*28*45cm Delivery time: 20~30days. Suitable for screw and unscrew work of big truck and lorry. Bus. Large machines etc.