These inserts are very useful when you need to keep safe the nut or bolt you're tightening. I really recommend to use them.
I own a lot of Craftsman tools. I purchased these for a large job at work (2 sets). I inserted them into my sockets and within 2 hours the magnets had fallen out of the sockets I was using. Maybe I got a couple bad sets, but I was very disappointed that these did not hold up to the quality of my other Craftsman tools.
everyone fits well and will probably hold a nut but the 10mm one is worthless won't hold a washer cause the magnet is so small