Supports instruments and test equipment used to install and maintain electrical components in an enclosure. Also ideally suited for supporting laptop computers, monitoring units and other equipment used with programmable controllers. The shelf can be installed on the inside or outside surface of larger industrial enclosures. Automatically locks in the horizontal position when raised. When not in use, the shelf folds to 1.73 inch from the mounting surface. All parts are heavy gauge steel. Maintains UL/CSA type 4 and 12 when properly installed on a enclosure.