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 four flutes and a right-hand spiral. The overall length is 3 inches and the shank diameter is 1/2 inch. The mill diameter is 1 inch with a 1/8 inch corner radius. It can machine aluminum, brass, bronze, cast iron, and plastic at speeds up to 325 SFM. This is a general purpose end mill suitable for a variety of applications.