StarTech.com 2.4 x 3.9in Vertical Cable Management D Ring

1.5U Metal D-Ring Hooks - Wire Organizer for 2 or 4-Post Network/Server Racks (CMHOOKMW) - Cable management ring - black - 1U - for P/N: RACK-18U-20-WALL-OA, RACK-21U-20-WALL-OA, RACK-24U-20-WALL-OA, RK3236BKF, RKQMCAB12V2