With the assurance you are Ready for the Road Ahead , the Power Products 7" Stud Top 2-Battery Harness Cable provides a proper jumpstart for heavy duty Group 31 stud batteries a proper jumpstart solution, with the ability of connecting up to 2 batteries. For a smooth, quick start up for your truck, position tin plated copper lugs on the top stud to best boost the charge of the battery. Easily expand the battery bank's capacity or voltage with this stud top battery harness cable. This replacement heavy duty battery harness cable is built with heavy duty requirements in mind, being corrosion resistant with superior conductivity, which increases current transfer to your vehicle’s power system.