The Micro 100 Square End Mill Center Cutting is a high-performance end mill designed for milling a wide range of materials. This 1/4" diameter, 2 flute end mill has a square end for milling 90 degree shoulders and slots in aluminum, steel, stainless steel, cast iron, titanium, plastic and other materials. It features a TiAlN coating for heat and wear resistance during high speed machining. The center cutting design allows plunge cutting and drilling. Recommended speed is 25,000 RPM with a feed rate of 10 IPM. It has a shank diameter of 1/4" and an overall length of 2-1/2". Made in the USA by Micro 100 Tool Corp.