Hatch is made with a slant back that makes it perfect for use when a support or beam is located near its placement. Slant is also helpful for mounting gravity feed filling positions such as gasoline. Made of durable plastic for a long life that resists fading, discoloring, UV rays, road salts and acids. Can be painted to match exterior with no preparation. Cut out dimensions: 6-11/16" x 6-3/4". Outside dimensions: 9-1/2" x 9-1/2".