QNAP RAIL-A02-90 Rackmount Rail Kit for TS-EC2480U-RP TVS-EC2480U-SAS-RP Dimension: 710 x 99 x 68 mm (28.4 x 3.96 x 2.72 inch) Max Load: 45 Kg Applied Model: TS-EC2480U-RP, TVS-EC2480U-SAS-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' ~ 34.3'/578.6mm~871.5mm D. The distance between two rack posts is 18.3'/465mm (center-to-center measurement of the rack's square holes).