Quickcar 55-021 Master Disconnect Switch with Silver Plate This QuickCar Battery Master Disconnect Switch comes with a silver square mounting Panel that measures 2-1/2 x2-1/2 Most racing organizations and sanctioning bodies require these for an emergency cut-off switch. QuickCar s master disconnect switch has a bright red epoxy coated handle and accepts 3/8 In ring terminals for battery posts.Master Disconnect Switch with Silver Plate 55-021