This Supermicro 1U Rail Kit (MCP-290-00004-03) is excellent for short-depth chassis with simple screw mounting. The rail kit is compatible with CSE-512F and can extend up to 33.05" in length. Brand - Supermicro Outer Rail Extendable Length - 25.6" to 33.05" Rail Kit Type - Rail Kits Designed For - 1U Compatible Chassis - CSE-SC512F Mechanism - Linear Friction Rail New, open box