From the top of the wall box mount to the bottom of the cage this polished aluminum bulkhead light measures about 11 1/2 inches tall x 4 inches wide (not including the mount holes). When mounted to the wall it will extend out by about 7 inches.  The junction box on the light measures 4 3/8 inches in diameter, and the two mounting lugs extend out and make it 6 1/4 inches.  This light weighs just under 3 1/2 pounds.