These are amazing for what I need them for. So far I've ran this endmill through this job 2 times. The program is just over an hour making it around 2½hrs of use in total. This bit is still cutting like butter and ready for the next job. These are the only endmills I will buy from now on. Don't go spend $60 on an Amana when you can get 5 of these sub $40. Just stop searching and buy these. Thank me later.your welcome!