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. The operating speed range is 120 to 220 SFM. It can be used on steel, stainless steel, cast iron, aluminum, copper, brass, bronze, plastic, and fiberglass.