The Micro 100 Square End Mill Center Cutting 14M415 is a square end milling cutter made by Micro 100. It has a 1/4" shank diameter, 1/2" cutter diameter, 2" overall length, and 2 flutes. The end mill is center cutting and made of solid carbide for wear resistance and strength when milling steel, cast iron, aluminum and other non-ferrous metals. It can be run at speeds up to 25,000 RPM. The square shape allows milling of shoulders, slots and angles.