- Synology Rail Kit RKM114 (Rail Kit Mounted) is a fixed rail solution with easy installation design and supports most Synology 1U RackStation models. RKM114 is backed with Synology's 1-year limited warranty. - Applied Models: Rack mounting depth: 570mm to 720mm * 19 series:RS1219+, RS819 * 18 series:RX418 * 16 series:RS816 * 15 series:RS815, RX415 * 12 series:RS812RP+, RS812+, RS812 * 11 series:RS411 * 10 series:RS810RP+, RS810+, RX410 * 9 series:RS409RP+, RS409+, RS409, RX4 Rack mounting depth: 570mm to 810mm * 20 series:RS820RP+, RS820+ * 19 series:RS1619xs+ * 18 series:RS818RP+, RS818+ * 15 series:RS815RP+, RS815+, RC18015xs+ * 14 series:RS814RP+, RS814+, RS814s)