These are to fit the 3 1/8" inside diameter, black in color and are held in place by a steel worm clamp. Price is per each.There were two styles, and this one is plain with no dividers. Make sure you check yours before ordering as they don't interchange. Orders accepted online (preferred), or by phone toll-free 1-877-253-7882 or email firstname.lastname@example.org. If in doubt as to which one you have, send us an inside photo of yours. Not genuine SJE caps and no returns.