12 Volt Skull Light Red with Green Eyes. Your imagination is the only limitation as to where you could install this. Park light? Under hood accent? Grille? Dash? Back deck? The head is about 1 1/2" wide, 2 1/4" tall and 1 7/8" deep. The chrome base mounting stud is 3/8" fine thread. Very serviceable, as you can see. This is a nice accessory for your favorite classic car, cruiser, rat rod, pick-up, boat, motorcycle or tractor. Or, it could be a nice accessory for the riding lawn mower?