1、Function: This battery master switch can disconnects the battery safely, quick cut off of electrical power to eliminate any power drain from the battery when vehicle or boat is not in use. 2、Premium Material: Two copper terminals with stainless steel hex nuts on the base for improved continuity. Rust resistant and long durability. 3、Stable Performance: Rated at 200 Amps continuous 12V DC, 50 Amps continuous 24V DC, provides stable performance transmission. 4、East to Use: Master battery disconnect switch with detachable knob and with spring, can be controlled by switching to a 45° clockwise position. 5、Wide Application: This battery disconnect switch is universal used for trucks, cars, RVs, trailers, boats, marine applications, or any vehicle with 3/8in diameter terminal.