is the d ring metal or plastic?

Hey Steve, it's a metal D ring. Sturdy as hell too, I bought 6 of these and have had no issues with any of them.

What material is the StarTech.com CMHOOK1UN cable management hook made of?

The CMHOOK1UN is made of steel.

What are the dimensions of the StarTech.com CMHOOK1UN cable management D-Ring hook?

The external dimensions are 2.2 inches in height and 4 inches in width, while the internal dimensions are 2 inches in height and 3.6 inches in width.

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StarTech.com CMHOOK1UN 1U Vertical Server Rack Cable Management D-Ring Hook - 1.8x3.9in (4.5x10cm)

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Style: 1.8 x 3.9in

1.8 x 3.9in
2.2 x 3.9in
2.4 x 3.9in - Multi-Directional

CMHOOK1UN
Black

Overview

Specs

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Add a cable management hook to your server rack or cabinet for strain relief and

Model
Brand	StarTech.com
Model	CMHOOK1UN

Details
Type	Cable Management
Color	Black
Specifications	Industry Standards: EIA RS310-D U Height: 1U Enclosure Type: Steel External Height: 2.2 in [57 mm] External Width: 4 in [101.3 mm] Internal Height: 2 in [50.6 mm] Internal Width: 3.6 in [92.6 mm]

Features
Features	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

Additional Information
First Listed on Newegg	January 12, 2026

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StarTech.com CMHOOK1UN 1U Vertical Server Rack Cable Management D-Ring Hook - 1.8x3.9in (4.5x10cm)

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Item#: 9SIBSWCKRR3025

Best Sellers

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StarTech.com CMHOOK1UN 1U Vertical Server Rack Cable Management D-Ring Hook - 1.8x3.9in (4.5x10cm)

Learn more about the STARTECH CMHOOK1UN

Customer Reviews of the STARTECH CMHOOK1UN

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info