Review on 🔌 CESFONJER Binding Post Connector: 4mm Banana Socket with Speaker Terminal - Pack of 25 Female Socket Jacks in 5 Colors by Steven Pankey

You get what you pay for. They are smaller than I expected and are metric. Maybe it's in the description and I just missed it. The problem for me is that the mounting nuts are metric and I didn't have a small enough metric wrench to fit. It comes with a tool, but it's pretty big. It barely fit in my project box and only after I had to remove some components. The plastic knurled nuts are 100% plastic, they are not nickel plated like other racks I have purchased in the past. While I haven't shared it yet, I bet it will be easy and I expect that at some point someone using my project will delete it. I throw away the rest and buy elsewhere for my next project.