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, a 1-1/2" overall length, and a 3/4" cut diameter. The end mill has four flutes and a right-hand spiral. It is designed for use on steel, stainless steel, cast iron, aluminum, brass, bronze, and plastics. The end mill provides accurate cuts and smooth finishes at high feed rates.