The CMHOOK1U Vertical Cable Management D-ring lets you add a 1U metal cable hook to your server rack or cabinet to provide an organized channel for your cables. Constructed of high-quality steel, the cable D-ring measures 2.2 x 3.9in (5.7 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 your rack where you need them for a versatile cable management solution.