Includes: housing, door, hinge, latch, gas cap, spout and install instructions. It can be installed in steel or fiberglass panels. This part is a 7" radius. Door is 3-1/2" square. It's most common use is in the rear fender of cars and truck from around 1936 to the early 1950's. The top is made of 18 gage mild steel. The spout is 2" o.d. and 3-3/4" long. Hinge is spring loaded to hold the door open and closed. Latch is spring loaded and magnetic. Part comes with spout, cap and pictured instructions.