Large Texas Mason Decorative Masonic Concho, Square and Compass 1 3/4 Diameter Screw Back Concho Extremely Ornate in Design, Worthy as the man that wears it. Beautifully crafted, with an included mounting screw Revive an old item, Personalize a new one. The average size of our conchos is 1 3/4 inches in diameter. Turn simple items into expensive gifts