My rating of 4 stars instead of 5 is based solely on some blur in the listing. I have not used this cutter yet. The description says it is a 4 flute cutter but the pictures show a 6 flute cutter. The one I received has 4 grooves. The description also mentions "more cobalt" but doesn't list the alloy which kind of shortens it because when I checked the product description on the Melin website they listed M42 which is the highest grade of HSS cobalt alloy!