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, 1" overall length, and a 1/2" 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. The end mill provides accurate cuts and smooth finishes at high RPMs. With proper speeds, feeds, and depths of cut, this end mill is suitable for a range of milling operations.