Synology Rail Kit - Sliding Sliding rails making RackStation in and out for easy maintenance A. Mount post width must be equal to or greater than 450mm B. Panel width must be equal to or greater than 480mm C. Rack mounting depth: 610mm~890mm D. Rack mounting hole support: Square hole: at least 9.5mm x 9.5mm Round hole: at least 7.1mm x 7.1mm Applied models FS-series: FS6400, FS3600, FS3400, FS3017, FS2017 SA-series: SA3600, SA3400, SA3200D UC-series: UC3200 21-series: RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+, FX2421 20-series: RS820RP+, RS820+ 19-series: RS1619xs+, RS1219+, RS819, RXD1219sas 18-series: RS3618xs, RS2818RP+, RS2418(RP)+, RS818(RP)+, RX418 17-series: RS18017xs+, RS4017xs+, RS3617xs+, RS3617(RP)xs, RX2417sas, RX1217sas, RX1217(RP) 16-series: RS18016xs+, RS2416(RP)+, RX1216sas, RS816 15-series: RC18015xs+, RXD1215sas, RS815(RP)+, RS815, RX415 Other EOL models: https://www.synology.com/zh-tw/products/RKS-02 Installation Guide: https://bit.ly/3loTF10