Review on Amana Tool 46415 2 Flute Down Cut by Anuj Mierzejewski

These are consistently the best bits I've used in the past year. They have a good lead and run faster than most. The downside I could name is the price, but you always pay more for the best. I'm increasingly preferring straight helix compression bits because they cut more cleanly on both sides of the sheet metal. They cut fast and retain a good edge even after hours of CNC milling.