StarTech.com 2.4 x 3.9in Vertical Cable Management D Ring - 1.5U Metal D-Ring Hooks - Wire Organizer for 2 or 4-Post Network/Server Racks (CMHOOKMW) Black

Good quality material, no sharp edges. Mounting holes are an odd choice, and prevent use around equipment. If they were punched for each hole in a U, it would probably weaken them some, but would allow for integration with existing, used mount points.

I have a 42u server rack in my basement with about 8 servers. These worked great for routing a/c power cords up to the servers. I also used these to hold a service loop from my patch panel to the servers. Will buy more of these in the future. Have already recommended these to friends.

These are very sturdy, they could probably hold more than cable, I used a bunch of these in the back of my server rack to route and hold external cables vertically, keeping them seperate from "internal" cables contained within the rack. Buying a few more.

Works great and as expected

These were a little thinner than I expected, making a relatively sharp edge for the cable to ride. Works well to manage vertical runs but I'd avoid draping cable across the edge. Looking closely at the picture, I should have realized this limitation before purchasing.