Spec Sheet Preview: The Alpha Communications® models IH101 and IH102 are flush steel mounting boxes and rings, made of heavy gauge steel, in a galvanized finish. They are our most popular mounting accessories, and are used with a variety of flush mount intercom remote and master stations. The IH101 is a fully enclosed box, designed to be nailed or screwed to a mounting stud, or set into concrete or masonry. Convenient knockouts on the top and bottom of the …