These are good plain end mills. If you're doing work that requires accuracy to a few thousandths, they're not for you. If you're in a big company, they're not for you. If you need a basic end mill for some basic hobby milling work this is excellent value for money but I know there are much better tools out there but at a much higher price. Personally, I use them for 6061 milling as a hobby. and they are always good enough for my needs. .