Ruthie, a hoop of 18" would not work on a standard home machine. The keyhole of the average machine is 5-7", so the largest hoop possible would be only 10". Maybe you need to define more clearly what you are looking for and how you plan on using it. There are machine quilting frames available in different size and price range, but these also are limited with the standard sewing machine. May I suggest you do a google search of machine quilting frames and see if this is what you mean by a hoop.