Panel-Mounted Battery Mini Selector Switch. Panel-mounted switches are designed specifically for panel mount applications. This range gives a very compact, versatile solution.. Compact, lightweight. 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. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.