I really can't recommend these bits. The first ones I ordered "honestly" worked. The cut was a bit rough but the two I bought this time didn't last at all. I cut the jigsaw pieces out of 1/4" thick Baltic birch plywood. I usually get 5 to 6 large velociraptors from a bit. Halfway through the first I had to kick out a new beat. The cut is so bad I left the pieces that I cut can't use - waste of material.I think you get what you pay for!These cheap end mills aren't even worth the hassle.