Swan Battery Disconnect Switch for Side Post Battery - Anti-Theft - Solid Brass - Easy Install Easy & foolproof way to disconnect battery & disable vehicle Unscrewing the knob stops current flow from the battery & prevents vehicle from starting Easy install - just remove positive cable, attach to disconnect switch & reattach to battery Designed to fit most side post batteries in cars, trucks or equipment Great for storage/collectible cars. Solid brass with nylon insulator, galvanized steel post bolt