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 low carbon steel, alloy steel, tool steel, stainless steel, cast iron, aluminum, brass, bronze, and plastics. The square end allows milling of 90 degree shoulders and corners in one pass.