Very good for the price. The first batch I bought made for a long night stretching hardware to build a shelving unit for my 3d printer stand out of 3030, some brackets that I purchased from this site, and the spring loaded T-nuts. That was partially my fault for buying just enough, and partially the fault of the T-nuts. The M5 threads were about 75% on being able to run my hardware into prior to chasing with an M5 tap. Do yourself a favor and plan to check by hand tightening a few sacrificial M5x10s or longer into the nuts and chase any ahead of time with an M5 tap that aren't cooperative. Still a great value, and in my opinion better than standard T-nuts for a big project you might reconfigure later, but takes some extra work with an M5 tap or a lot of extra T-nuts. I'm pleased enough with my experience that I bought a lot more for my second shelving unit.
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