QNAP RAIL-B02 Rack Slide Rail Kit for TVS-471U & other 2U series models (QN-RAIL-B02) (1 Year Manufacture Local Warranty In Singapore) NAS installation and maintenance made convenient Features QNAP Rail Kits assist in the installation of rackmount QNAP NAS. The sliding rails make it easier to slide QNAP NAS in and out for easy maintenance and management. QNAP NAS rackmount models comply with ANSI/EIA-RS-310-D rack mounting standards. Before purchasing server racks, please make sure the server racks conform to the matching specificatio 1. Rack sizeA. Mounting post width: ≥ 17.8" / 451 mmB. Panel width: ≥ 19.1" / 485 mmC. Mounting post depth: 18" ~ 32" / 443 ~ 815 mmD. The distance between two rack posts (center-to-center measurement of the rack's square holes) is 18.3" / 465 mm 2. The rack kits are only compatible with 9.5 mm x 9.5 mm square-hole server racks. Optional RAIL-A03-57 RAM-32GDR4ECS0-UD-2666 Other Featured QNAP NAS Models: QNAP NAS COLLECTIONS