Wall Racks Ideal for smaller filing systems near the work space. It provides you with a number of files within easy reach. Come in standard 31" and 63" lengths and attached to most any wall structure. Custom lengths are also available. Wall racks hold up to 25" width files/jobs. A Wall-Unit is especially useful if placed next to the work space. The small wall unit takes up little space, can be attached to almost any type of wall and has a profile length of 7.8 in.