The Extreme Networks XEN-R000291 is a Fixed Rack Mount Kit for the Summit X650, X650-F and X650-24t Ethernet switches. It is also compatible with the Summit X670, X670-G2, and X670V switches. The kit includes the necessary brackets and screws to mount the switch in a fixed rack configuration. This kit is designed to be used with a standard 19-inch rack and can be installed in either a front or rear-facing configuration, depending on your specific installation needs.