QNAP RAIL-A03-57, RACK SLIDE RAIL KIT - FOR 2U/3U TS-ECX80U (EC1680U) SERIES (MAX 57KG LOADING)
Dimension,710 x 99 x 68 mm (28.4 x 3.96 x 2.72 inch)
Weight: 2.63kg (5.80lb)
Max Load: 57 Kg
Applied Model: TS-1673U, TS-1673U-RP, TS-879U-RP, TS-1279U-RP, TS-EC879U-RP, TS-EC1279U-RP, TS-1679U-RP, TS-EC1679U-RP, WB-1200U-RP, WB-1600U-RP, TS-EC880U-RP, TS-EC1280U-RP, TS-EC1680U-RP, REXP-1220U-RP, REXP-1620U-RP, REXP-1220U-RP, TS-EC880U R2, TS-EC1280U R2, TS-EC1680U R2, TVS-EC880U-SAS-RP, TVS-EC1280U-SAS-RP, TVS-EC1580MU-SAS-RP, TVS-EC1680U-SAS-RP, TVS-EC880U-SAS-RP R2, TVS-EC1280U-SAS-RP R2, TVS-EC1580MU-SAS-RP, TVS-EC1680U-SAS-RP R2, TDS-16489U, TES-1885U, TES-3085U, TS-1677XU-RP, TVS-1672XU-RP, TS-1683XU-RP
please make sure the server racks conform to the following criteria:
1. Rack size 
A. Mounting post width: ≥ 17.8'/451mm 
B. Panel width: ≥ 19.1'/485mm 
C. Mounting post depth: 22.8' ~ 34.4'/579.1mm~873.5mm
D. The distance between two rack posts is 18.3'/465mm (center-to-center measurement of the rack's square holes).