StarTech.com Cable Management Assessories - StarTech.com CMHOOK1UN, The CMHOOK1UN Vertical Cable Management D-ring from StarTech.com enables you to add a 1U metal cable hook to your server rack or cabinet to provide an organised channel for your cables. Made from high-quality steel, the cable D-ring measures 45 x 100mm 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. This product is backed by a 2-year warranty. StarTech.com CMHOOK1UN Cable Management Hook 1U - 4.5x10cm