The Micro 100 16T639 is a 1/8" diameter carbide drill mill with a length of cut of 1-1/4". It has a 135 degree split point tip and is designed for use on steel, cast iron, aluminum, copper, brass, bronze, and plastics. The drill mill has a bright finish and features a TiAlN coating for increased tool life and heat resistance. With an overall length of 2-1/2", it can be used for a variety of drilling, milling, and boring applications. The drill mill is made in the USA by Micro 100, a manufacturer of precision cutting tools.