The 12V/24V DC Socket Extension was designed to be used in conjunction with your vehicle™s DC accessory socket (aka the cigarette lighter plug). With its weatherproof rubber cover and generous 12 foot cord, the 12V/24V DC Socket Extension is one valuable yet inexpensive investment for your outdoor lifestyle! The 12V/24V DC Socket Extension is capable of being mounted with the supplied threaded nut to nearly any flat surface including a truck bed, vehicle dashboard, or panel. The required minimum diameter of the hole is 1-1/4 (31.75mm) with a maximum material thickness of 7/16 (11.11mm).