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 is uncoated and made in the USA. The end mill is designed for use on steel, stainless steel, cast iron, aluminum, copper, brass, bronze, plastic, and wood.