... changes, heavy automotive and truck work. DESCRIPTION:XF-231 Air Impact Wrench*square drive size:1/2"*capacity bolt dia.:16mm*free ... /2" air impact wrench set*1/2" air impact wrench*1pc extention bar*1pc 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