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 a 1/2" shank diameter, 1-1/2" overall length, and a 1/2" cutting diameter. The end mill has 4 flutes and a right-hand spiral. It is uncoated and made in the USA. The end mill can be used on steel, stainless steel, cast iron, aluminum, copper, brass, bronze, plastic, and fiberglass at speeds up to 2000 SFM.