These connectors are cheap and can't be used in a professional environment. I have uploaded two pictures where the potential cracks are visible. I though these were really made by Belkin, but there are no Belkin trademarks on them, but this is not important. What is important is that 80% of the connectors are broken. Most of them have "lines" on them, which become cracks when you crimp them. At first, I though it was my crimping tool, but I tested it with other connectors and everything was fine! Most of the connectors from this set break when you try to crimp them and have to be replaced. This is just a waste of money, time, connectors and cable!