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 0.5 inches. The mill diameter is 0.625 inches with a 0.03 inch corner radius. It can machine aluminum, brass, bronze, cast iron, steel, and most alloys. This end mill is designed for high feed rates and productivity in light milling applications.