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Top Post Knife Blade Battery Switch The top post knife blade battery switch is used for the battery to isolate and secure the electrical system, eliminate any power drain from the battery when vehicle or boat is not in use, disconnect the battery safely. 45# steel plated brass construction, rust and corrosion-resistant, durably made for safety use. Lift the knife, power is cut, Put down the knife, power is connected. Easy Installation guaranteed, ready to use in 5 minutes. Ideal for car, truck, boat or RV battery, also for other electrical equipment's Battery. Specification Weight: 0.5 lb. Package List 1 x Switch