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.

MXN$329^.43

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

Style: 1.8 x 3.9in

Overview

Specs

Reviews (5)

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

Manufacturer Warranty
Parts	2 Year
Labor	2 Year

Additional Information
First Listed on Newegg	January 09, 2014

Return for refund within: 30 days

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Warranty Notice:
This product does not include manufacturer warranty when purchased or used outside of its designated sales region. By purchasing internationally, you acknowledge that warranty support from the manufacturer will not be available.