Citas preces CyberPower | 4POSTRAILKIT1832 Rackmount Rail Kit | Adjustable Rails: Extend from 18.5” to 29” for proper fit with various sizing requirements; 4-Post Mounting: Secures equipment at both the front and back of the rack; Mounting Hardware: Sixteen (16) M5 x 12 screws are included to secure the rails to each post