Our cost sensitive 3″ and 4″ legs not only offer you a lower price, they also add a design element to the bottom of the leg. The bottom of this Gibraltar leg has a visible plastic ring that is part of a larger insert that holds the leveler inside the tube. The visible ring is 1/4″ thick x 3-1/4″ diameter. The finish of the ring insert is black. Our 4″ diameter leg also has a plastic insert; this insert however is 4″ diameter, the same as the tube, and only 1/8″ thick so it is not easily visible. The finish of the insert is black.