If you were to think you could put on one of these collars and be able to look over the top of wall, you would be mistaken. Why, you'd never get your head through the hole to begin with. But if you need a replacement for the same fitting on your Adjusta-Stage, you've come to the right place. These are the guys that put a lot of the "adjust" in Adjusta-Stage. You get two in a set plus the necessary nuts and bolts to make them work.