Equip your semi truck to be Ready for the Road Ahead™, with the Cole Hersee 3/8" 6 - 36V Copper Stud Master Disconnect Switch, a key component that provides enhanced battery safety. To maximize the safety and efficiency of a vehicle's battery, this replacement component totally cuts the power from the battery to the rest of a system. Fashioned with a silver plated contact for maximum conductivity. FleetPride is your First Click in Heavy Duty®.