Slide rails for rack servers from Synology Assembly requirements Distance between mounting posts: min. 450 mm Unit width incl. mounting rails: min. 480 mm Rack mounting depth: 610 mm to 890 mm Rack mounting hole support: Square hole: at least 9.5 mm x 9.5 mm Round hole: at least 7.1 mm Compatible with: 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 Series 20:RS820RP+, RS820+ 19 series: RS1619xs+, RS1219+, RS819, RXD1219sas 18 series: RS3618xs, RS2818RP+, RS2418RP+, RS2418+, RS818RP+, RS818+, RX418 17 series: RS18017xs+, RS4017xs+, RS3617xs+, RS3617RPxs, RS3617xs, RX2417sas, RX1217sas, RX1217RP, RX1217 16 series: RS18016xs+, RS2416RP+, RS2416+, RS816, RX1216sas 15 series: RS815RP+, RS815+, RS815, RC18015xs+, RXD1215sas, RX415 14 series: RS3614xs+, RS3614RPxs, RS3614xs, RS2414RP+, RS2414+, RS814RP+, RS814+, RS814, RX1214RP, RX1214 13 series: RS10613xs+, RS3413xs+, RX1213sas 12 series: RS3412RPxs, RS3412xs, RS2212RP+, RS2212+, RS812RP+, RS812+ 11 series: RS3411RPxs, RS3411xs, RS2211RP+, RS2211+, RX1211RP, RX1211 10 series: RX410 9 series: RX4