The Sony NVRRAIL2U Slide Rail Kit for 2U Sony NVR’s helps easy mounting of Sony NVR-1830U, NVR-1830UD, NVR-1820U, NVR-1820UD, and NVR-J1830U onto a rack. Post installation, this rail kit allows easy access to the NVR for quickly replacing a drive that’s full or for a scheduled maintenance operation.