Rack Mounting Hardware20" 3-Section Ball-Bearing Sliding Rail kit for server cases.Compatible With the Following RackmountsThe Codegen Railkit is compatible with the following Rackmounts: 2U Rackmount 405mm Deep 2U Rackmount 600mm Deep 3U Rackmount 650mm Deep 4U Rackmount 500mm Deep 4U Rackmount 600mm Deep 4U Rackmount 600mm Deep 4U Rackmount 635mm DeepKey Features