Great for your sockets
Your review: I trimmed the little tags off that connect them together then placed into my 3/8" socket set both SAE & metric sizes. They fit nice and tight.
The socket itself is not magnetized so they will not keep you from those tight spaces. I tested each by placing a screwdriver into the socket to see if it would hold it. All sizes did but the smallest size had problems only due to its small sized magnet. I see these as a great help while working on my cars and other projects.