186-24 Galvanized Adjustable 26" Channel Supports with Adjustable Slot & Flat Nut by Atlas Sound. This mounting bar provides an adjustable slot and sliding flat nut which allows a wide range of enclosure or mounting ring positioning. It is ideal for use with Atlas Sound 75 and 76 Series mounting rings as well as 95 and 96 Series enclosures in 16" and 24" stud construction.