This is an NOS Blackout drive light. This is the late style as found originally on the M151A2 military jeeps and some other later trucks. This style is designed to easily change out bulbs. Just open it up and pop in a new bulb just like a tail light. You can put a 6, 12, or 24 volt bulb in this. Bulbs are just common automotive tail/marker light bulbs. These are plastic bodied and will take paint with no problem. They will fit in the blackout fender brackets on the jeeps easily. Don’t miss a very limited quantity.