This aluminum hatch with cover was used to pass through hoses or lines through it. The outside mounting frame is 11 1/4 inches long, 8 inches at its widest,  and just 5 1/4 inches at its narrow end.  It has 6 mounting holes.  The hatch cover measures 11 inches long including the hinge and latch. The opening 7 1/2 inches long and less than 4 inches at its widest.  It weighs about 4 pounds.