The CMHOOK1UN Vertical Cable Management D-ring lets add a 1U metal cable hook to server rack or cabinet to provide an organized channel for cables. Constructed of high-quality steel, the cable D-ring measures 1.8 x 3.9in (4.5 x 10cm) and offers a flexible opening for easy insertion of bundled cables. Providing strain relief for attached cables, multiple cable rings can be attached to rack where need them for a versatile cable management solution.