The CMHOOK1UL 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 5.9in (5.7 x 15cm) 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 our other cable management D-ring products for different size configurations: 1U Cable Management D-ring - 2.2 x 3.9in (5.7 x 10cm) - CMHOOK1U 1U Cable Management D-ring - 1.8 x 3.9in (4.5 x 10cm) - CMHOOK1UN Backed by a StarTech.com 2-year warranty. The StarTech.com Advantage Route cables neatly through your rack with an easy-to-install cable management ring Increase the longevity of your server and networking equipment interfaces by providing cable strain relief • Warranty 2 Years • Industry Standards EIA RS310-D • U Height 1U Physical Characteristics • Color Black • Enclosure Type Steel • External Height 57 mm [2.2 in] • External Width 154.7 mm [6.1 in] • Internal Height 50.6 mm [2 in] • Internal Width 146 mm [5.7 in]