The Adir Office Mobile Vertical Plan Center for Blueprints works equally well in harsh environments such as construction sites, and soft settings, such as modern offices. It glides easily across spaces on its 4 swivel casters, 2 of which brake for control of movement. Simply drop the files in and lift them out, as needed. The width is adjustable to fit 24 in., 30 in. and 36 in. hanging clamps (sold separately), and it can hold up to 12 clamps. Durable, convenient, and simple to set up.