Manufacturer Supermicro Outer Rail Extendable Length 26.5\" to 36.4\" Rail Kit Type Rail Kits Designed For 2U-3U Compatible Chassis CSE-213, CSE-216, CSE-217, CSE-218, CSE-219, CSE-823M, CSE-825, CSE-825M, CSE-826, CSE-827, CSE-828, CSE-829, CSE-835, CSE-836, CSE-837, CSE-936, CSE-937, CSE-938, CSE-939 Mechanism Ball-Bearing (Support Round Hole Racks with Adapter MCP-290-00060-0N)