Billet Proof Designs - Billet Aluminum RECTANGULAR Polished Fuel Door- Hot Rod Boat Marine Truck Mustang DIY Custom Machined from 6061-T6 aluminum and polished to a mirror finish. Stainless Steel hardware included. The door itself is machined from 1/4 inches thick plate and the outer ring is machined from 3/8 inches thick plate with an 1/8 inches lip to ensure a solid mount with a clean looking final product. We also offer an Oval fuel door as well! Dimensions of fuel door:Length = 4-1/2 inches Width = 3-1/4 inches Overall: Length = 5-1/2 inches Width = 4-1/4 inches