Waterproof Socket Power Outlet Cigarette Lighter Socket + LED 12V Voltmeter Panel Mount For Motocycle Benelli Aprilia KTM BMW The charger and voltmeter fits in a 1-1/8 holes in panels up to 1-1/2 inch thick with just the backing nut and in panels of unlimited thickness by placing the rectangular compression plate over the front of the two and securing it with two screws. The two holes are side by side on 1-3/4 centers. The plate dimensions are 4.0 x 1.75 The mounting screw hole pattern is on I centers for the two holes on the short side, and on 3-3/8 centers for the two holes on the long side. Easily installed in any 12V Motorcycle, ATV, Boat or Car Come with Free Set of Connecting Wires with built-in fuse, providing more space for installation This socket draws no power when not in use so it can't run your battery down.&lt;br&gt; &bull; The weatherproof sealing cap snaps over the front of the charger keeps moisture out when not in use Package includes: 1x Cigarette Lighter Socket + 1x Voltmeter + Set of Connecting Accessories + Set of Connecting Wires with built-in fuse