I bought these for my first CNC bit set. Besides looking very pretty, they cut perfectly! Even after cutting 100 ipm at 18.5k rpm, 0.25" DOC, the 1/4" end mill didn't even get warm after 8 minutes of cutting. I've crashed my car before. The chisel stuck in the aluminum traverse, which didn't bother him at all. It still cuts great. I highly recommend it!