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 1-1/2" overall length, and a 1/2" cutter 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 finish.