"A unique system for housing catalog sheets in a catalog rack. Operates similarly to a ring binder. Each base holds six 1"" capacity ring channels. Rings open and close without having to remove ring channel from the base platform, Features DubLock mechanism with three trigger positions: lock,unlock and open. Ring channels are easily snapped in place or removed. Reference angle is adjustable to either 30 degrees (low) or 45 degrees (high). Heavy gauge steel base is equipped with rubber feet and is painted in contemporary putty-colored enamel paint."