The 12V WAGAN 2257 Impact Wrench is designed to loosen and tighten vehicle lug nuts for tires. Keep it in your trunk for roadside emergencies. Simply plug this WAGAN 2257 Impact Wrench into your 12V DC vehicle power to quickly and easily change your tires. It uses low power and does not require alligator clamps to the battery to use. The 12v WAGAN 2257 Impact Wrench is packed in a convenient plastic carrying case.