Cup 1 escutcheons are for use with ½” and ¾” Fire Sprinkler Heads. Skirts A, B, and C are interchangeable with either cup to allow adjustment without having to re-cut drops. Cup 1 and Skirt A when used together have 2” of adjustment to accommodate minor irregularities in ceiling to sprinkler head location. This assures complete concealment of the ceiling penetration allowing only the sprinkler to be exposed. The Cups and Skirts are available in two standard thread sizes ½” and ¾” with three finishes chrome, brass, and white.