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 inch shank diameter, 1 inch overall length, and 4 flute design. The end mill has a TiN coating for increased tool life and lubricity. It is designed for use on steel, stainless steel, cast iron, aluminum, copper, brass, bronze, plastic, and fiberglass at speeds up to 2000 SFM. The end mill has a right hand spiral flute design for milling conventional materials.