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 inch shank diameter, 1 inch overall length, and a 1/2 inch cutting diameter. The end mill has 4 flutes and a right-hand spiral. It is designed for use on steel, cast iron, aluminum, and other non-ferrous metals at speeds up to 2000 SFM. This end mill is made in the USA.