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 0.375 inches. The mill diameter is 0.5 inches with a 0.03 inch corner radius. It can machine steel, stainless steel, cast iron, aluminum, copper, brass, bronze, plastic, and wood. The end mill has an American National Standard Stub length of cut and is made in the USA.