While not 100% perfect, SHINA STORE was able to get me a set of cutting tools quickly and at a reasonable price. I didn't expect them to be perfect, but for the fact that I'm using them for a ball joint defect, that's no problem. I suggest using them a little slower and looser, these are $10 cutting tools, by no means PARLEC level quality. They are perfect for my Linksprite router. If the supplier is reading this, I would suggest taking a look at the ball end grinding process and optimizing it further. On the other hand, they work great with soft materials (3D printed parts) so I won't complain too much!