Shop Nilight Top & Side Post Adjustable Knife Blade Master Kill Switch 12V 24V 250A Battery Negative Disconnect Shut Off Kill Power Isolator for Car Truck Marine RV Vehicle and Electrical Equipment in high quality, support 2 year warranty. Made of Heavy-duty solid brass that is rust and corrosion-resistant, this vertical blade type knife switch can be installed in seconds and operation is a breeze, durable, and safely disconnects your battery.