As someone who is still new to CNC, I'm still learning what bits to use in specific situations, but I can say that these are my findings brought to the next level. If, like me, you only use 1/8" or 1/4" end mills because you don't know any better, get one of those. The price is reasonable, the quality is decent, the company is reliable. You will be amazed at how much the quality of your carving will improve.