The Grainger Approved Square End Mill Single End is a high-speed steel square end milling cutter with 4 flutes and a right-hand spiral. It has a 1/2" shank diameter, 1" overall length, and a cutting diameter of 1/2". The square end mill is designed for slotting, side milling and straddle milling in both ferrous and non-ferrous metals. It can be run at speeds up to 2300 SFM. This durable end mill features TiN coating for increased tool life and heat resistance. The Grainger item number for this product is 14K535.