The N8958A is a rack mount kit that provides all the necessary hardware to rack mount one N8900 Autoranging System DC Power Supply (any of the 28 models) in only 3U of rack space when installing in a Keysight rack. This rack mount kit includes the necessary supports which take the place of standard rack rails and/or slides. The standard rack rails or slides are not compatible with the N8900 Autoranging System DC Power Supplies when installed in Keysight racks due to their width. Note that non-Keysight cabinets may not have the rack column features required by this kit.