Bought as a cheap end mill for my knee mill in Bridgeport. Works surprisingly well! After tamping the head, I managed to achieve an almost mirror-like shine. I really didn't expect it to work so well! A few notes from my experience: 1) You must reset your earbuds before using them. Mine weren't quite flush and initially affected the quality of the finish. 2) The speed on this end mill is very high because it only has 3 flutes. Mine runs at about 2,000 rpm.