Seller: bogertke0 (195) 100%, Location: Richmond, Minnesota, Ships to: US, Item: 402132638770 Antique Boiler Adjustable Pipe Brackets. One has an inside diameter of 3 inches. The other is 2.5 inches. They have a screw base that allows them to grow to more than 10 - 12 inches in length. Buyer pays shipping costs.