Wow what an end mill! I have about 30 minutes to cut full depth grooves in 3/16 inch brass. It's well balanced (in terms of cut, not to mention weight), removes chips well and is still sharp. I will update the review if I notice premature wear. I have many hours of editing to figure it out. At the moment I am planning to order more. End mill performance is still good. I was planning on ordering more but the price has almost tripled from my original purchase so I will buy locally. Maybe the original cost was wrong? Update: This end mill turned out to be one of the best I've used. for the flute, which is respectable.