Abstract: An end mill with a peripheral margin which increases in width from the terminal end of the tool to the shank portion of the tool. The end mill also has a tooth face made up of three tooth-face walls The depth of the tool face gradually decreases from the terminal end to the shank portion of the tool. The end mill also has an end cutting face which includes a flat, narrow land at the outmost region of the end cutting end. The end mill has chip breakers with rounded peripheral corners. The end mill can be made up of ultra-fine micro grain tungsten carbide with a cobalt content which varies throughout the length of the tool.