I really like the kobalt socket rails! I have tried kobalt, craftsman, Stanley, Carlyle, husky and a few others for sockets. They all fit great with just the right amount of retention. Kobalt stuff has a good warranty, bring the rail back if it doesn't fit right., they will give you another one. You might also bring in the offending socket to make sure it isn't just the socket, that is a really small size. Good luck!