Durable cut-off switch: Solid stainless steel nuts and washers resist rust and corrosion. Extends the life of your vehicle's battery. Cuts off power on racing cars and prevents fire. Safety: The small black insulator with a removable red key will not take up much space in your truck's battery system, while being perfectly accessible.Ensure your vehicle's safety with a reliable isolation switch to cut off power to your battery when not in use. Easy to install: Install it on a recreational boat motorhome caravan and other batteries you need. Perfectly shut off power and correct battery drain. Back cover isolates terminals from short circuit. Quick and easy battery disconnect helps you. Function: Marine Battery Disconnect can safely disconnect the battery, to eliminate any battery power consumption when the vehicle or boat is not in use. Compact size, modern and elegant appearance, sturdy and durable. Waterproof cover can better protect the key hole. Universal application: This battery switch power cut-off switch is widely applied to sailboats, yachts, pleasure boats, sport utility vehicles, buses, cars tourism, caravans, motorcycles , trucks, etc.