The solid brass circular frame of this wheel is tubular and ¾" thick. Engraved in the center of the wheel is "Brown Brothers Co. Ltd. Rosebank Ironworks Edinburgh". This ships wheel is durable, sturdy and will stand the test of time. In the middle of the ship wheel is a solid brass nave. The size of the wheel is measured from the end of the spoke to the end of the spoke on the opposite side. This Polished Brass 18" Ships Wheel with Hardwood Handles will enhance your nautical home decor and compliment any Nautical home decor collection. It is a great conversation piece and makes a beautiful nautical gift.