Seat: 12 inch diameter, with 1 1/4 inch turned down all around.
Fabricated from 11 GA mild steel (s.s. optional) with a 6 inch square x 3/16
inch thick backplate.
Wall plate: 7 inches x 11 inches x 1/4 inch welded to pivot arm assembly.
Support arm: fabricated from 7 GA mild steel bent plate.