1/2square drive drive. Reversible air ratchet ratchet for most applications in the automotive workshop & is ideal for radiator, fuel pump & spark plug removal. Durable all steel head. Display carton. specification:. 50lb-ft (6.92kg/m). 150rpm. 90psi (6.2bar). 4.0cfm (114l/min). 3/8 i.d. 1/4 bsp. 1.1kg.