American Standard 1660.118.002 18-Inch Shower Arm and Round Escutcheon, Chrome Durable brass construction is ideal for prolonged contact with water Standard 1/2 in. NPT works with many different showerheads Available in other finishes matching your other fittings For use with 1660.240, 1660.241, 1660.190 or 1660.194 - all sold separately. Height - 2-1/2 inch