1/2" DR. Air Ratchet Wrench 1/2" DR. air ratchet wrench Working around tightly packed engines, machinery and equipment General specification Std. Bolt Size : 1/2" inch / 12.70 mm Overall Length : 10-1/4" inch (260 mm) Air hose : 3/8" ID Air pressure : 90 PSI (6.2 bar)