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 ... mini oiler*1pc air nipple*10pcs sockets set;socket size:9,10,11,13,15,17,19,22,24,27mm Twin Hammer Type Air Impact Wrench