Unleash the power of reliability with Shizzams' 12V Key Battery Isolator Switch, perfect for any hotrod enthusiast! This compact, sleek, and modern 300A main switch boasts a diameter of 10 mm and a max load capacity of 300 amperes, ensuring unbeatable performance. Featuring two pin/contacts, a moisture-protective cap, and versatile functionality as a circuit breaker or main switch, Can also turn off the power of racing cars and prevent fire, built tough and weighs just 232g. At 12 x 13 x 6.5 cm, it fits seamlessly into your setup, offering practicality without sacrificing style. Experience quality and convenience with Shizzams, where we unite style and functionality effortlessly!