1)1/2" Air Impact Wrench (twin Hammer Type) 2)Common applications are tire changes, ... heavy automotive and truck work. DESCRIPTION:XF-231 Air Impact Wrench*square drive size:1/2"*capacity bolt dia.:16mm ... no load:149L/minSPECIFICATION :1/2" air impact wrench set*1/2" air impact wrench*1pc extention bar*1pc mini oiler*1pc ... ,15,17,19,22,24,27mm Twin Hammer Type Air Impact Wrench