Add a cable management hook to your server rack or cabinet for strain relief and organization. The CMHOOK1UN 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 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 your rack where you need them for a versatile cable management solution. Please see other cable management D-ring products for different size configurations: 1U Cable Management D-ring - 2.2 x 5.9in (5.7 x 15cm) - CMHOOK1UL; 1U Cable Management D-ring - 2.2 x 3.9in (5.7 x 10cm) - CMHOOK1U.