I have four sets of 7 cast iron drapery rings purchased from Pottery Barn that were used for about a year. They currently sell for $24.50 a set at Pottery Barn. I`m asking $15 a set or all 4 sets for $50. That`s about $1.78 a ring if you buy all 28 of them compared to $3.50 plus tax new.Interior diameter 1.25", exterior diameter 2", approximately 0.3 " thick. Fits standard drapery rod.