Steel Folding Shelf is an ideal accessory to support laptop computers, monitoring units and other equipment used to install and maintain electrical components in an enclosure. The shelf can be installed on the inside or outside surface of Free-stand or Floor-Mount enclosures (except ProLine). It automatically locks in the horizontal position when raised. When not in use, the shelf takes up minimal space and folds to 1.73 in. (44 mm) from the mounting surface.