The Grainger Approved Square End Mill Single End is a high-speed steel end mill with a square end for milling slots, keyways, and pockets. It has a 1/2" shank diameter, a 1/2" cutting diameter, a 1-1/2" overall length, and a 14 flute count. The end mill has a TiN coating for increased tool life and lubricity. It is designed for use on steel, stainless steel, cast iron, aluminum, copper, brass, bronze, plastic, and fiberglass at speeds up to 325 SFM. This end mill is made in the USA by Grainger Approved.