Insulated Plastic/Metal, Power Cut Off Switch, Use For 12V DC Circuits With Maximum Continuous A Draw Of 50A & A Maximum Surge Draw Of 300A, Has Two 1/4" Diameter Studs With Steel Zinc Plated Nuts & Solid Brass Washer For Battery Cable Mounting, Equipped With 2 Keys, A Key Operates The Switch To Be In Either The On Or Off Position, Key Hole Is Covered With A Rubber Cover When Not In Use.