Synology Rail Kit RKS1317 (Rail Kit Sliding) comes with sliding rails for easy server maintenance, and supports most Synology 1U/2U/3U RackStation models. RKS1317 is backed with Synology's 1-year limited warranty.Physical specifications for Synology RKS1317A. Mount post width must be equal to or greater than 451mmB. Panel width must be equal to or greater than 480mmC. Rack mounting depth: 610mm to 890mmD. Rack mounting hole support:-square hole: at least 9.5mm x 9.5mm-round hole: at least 7.1mm x 7.1mmApplied Models18-series: RS3618xs, RS2818RP+, RS2418(RP)+, RS818(RP)+, RX41817-series: FS3017, FS2017, RS18017xs+, RS4017xs+, RS3617xs+, RS3617(RP)xs, RX2417sas, RX1217sas, RX1217(RP)16-series: RS18016xs+, RS2416(RP)+, RX1216sas, RS81615-series: RC18015xs+, RXD1215sas, RS815(RP)+, RS815, RX41514-series: RS3614xs+, RS3614(RP)xs, RS2414(RP)+, RS814(RP)+, RS814, RX1214(RP)13-series: RS10613xs+, RS3413xs+, RX1213sas12-series: RS3412(RP)xs, RS2212(RP)+, RS812(RP)+, RS81211-series: RS3411(RP...