Carbide End Mills

Once you use them, you will wonder why you would ever use High Speed Steel (HSS) again.  I am trimming a piece of 1.01" aluminum square to .990".  For the first side, I used the first 1/2" end mill that I found in the drawer which was HSS.  For the second side, I used my 1/2" carbide end mill.  Much faster cutting and a nicer finish.