The design of this photo frame is based on an enlarged center lock nut of a racing wheel and is machine-cut from billet aluminium with natural machine cut marks. It measures 5.9 inches in diameter and is 1.6 inches thick. Replacing a photo involves simply removing the rubberized pad at the back. There are also two detachable metal pin extensions to prevent the frame from tipping backwards. Proudly display your special photos like a true race fan with this centre lock nut photo frame.