An end mill is a specific type of milling cutter which is used in the process of removing material with rotary cutters. Able to cut in a radial direction, the end mill is designed in order to cut axially as well. The end mill is commonly used in face milling, profile milling, and tracer milling. End mills are categorized based on the style of cutting they do, number of flutes they have, the helix angle when applied, and the material they are made of. End mills, when built with an odd number of flutes, are best measured using a v-anvil micrometer.