Panel-Mounted Battery Master Switch. Panel-mounted switches are designed specifically for panel mount applications. This range gives a very compact, versatile solution. Compact, lightweight. Removable key. Countersunk recesses for surface mount application. Standard 2-1/16 52 mm hole cut out same as standard gauge hole . Inside captive inserts for 3/16 4.8 mm nuts providing full access for cables with no restrictions. Standard interchange label system. Molded in high temperature, fiber reinforced plastics Panel-mounted switches are designed specifically for panel mount applications. This range gives a ve Removable key. Countersunk recesses for surface mount application Standard 2-1/16 52 mm hole cut out same as standard gauge hole . Inside captive inserts for 3/1 Standard interchange label system. Molded in high temperature, fiber reinforced plastics