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. This end mill is uncoated and made in the USA. It can be used for a variety of materials including steel, stainless steel, cast iron, aluminum, copper, brass, bronze, plastic, and wood. The square end allows milling of 90 degree shoulders and corners in one pass.