This carbide end mill set features high quality USA made Kodiak brand end mills which are made from premium sub-micrograin carbide. This kit contains 5-flute high-performance 45 degree end mills which are center cutting. These tools are designed for profiling and finishing and work well on exotic materials, stainless steels, carbon steels and other similar materials. Shank diameter is the same as the cutting diameter of the : +.000/-.002 Diameter, -.0001/-.0004 Shank Diameter Contains one each of the following: 1/8" DIA x 1/4" LOC x 1-1/2"OAL, 3/16" DIA x 3/8" LOC x 2" OAL, 1/4" DIA x 1/2" LOC x 2" OAL, 5/16" DIA x 1/2" LOC x 2" OAL, 3/8" DIA x 5/8" LOC x 2" OAL and 1/2" DIA x 5/8" LOC x 2-1/2" OAL.