Overall solid aluminum housing painted with a silver aluminum colored finish measures 15 inches across in diameter. Depth is about 1/2" except where porthole clamps are at 3" tall. Weight approximately 5 lbs.
Glass mirror portion is 9" across in diameter. When (fully functional) porthole is opened, there is a circular space of 11-7/8" across in diameter.
Three countersunk screw holes for mounting (under clamps and hinge areas so hidden from view). Brand new and packaged very well for transit.
Folks use these in many creative ways; one favorite being a nautical beach theme picture frame.