The rack ears compatible with Cisco SG 200 300 500 Series Switch. Compatible for Cisco Small Business SF GE 500 series - SF500, SG500, SG500X. All 24, 28, 48, and 52 port versions The rack mount kit are made of thickened metal, which is stronger and has high bearing capacity, durable to use, the installation is firm and not easy to fall. Each kit contains 2 black rack mount ears, 8 switch screws and 4 sets of cabinet kits (screws + snaps). It is a good complement for some switches not equipped with mounting ears. Rack Mount Kit Universal Rack Ears Compatible With Cisco SF500 SG500 SG500X Switch