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 an overall length of 3 inches, a shank diameter of 0.5 inches, and a square end cutting diameter of 0.375 inches. This end mill is designed for slotting, side milling and straddle milling in low carbon steels at surface speeds up to 135 SFM when used with rigid setups. It features a TiN coating for increased tool life and lubricity. Made in the USA, this end mill provides good performance in general purpose milling applications.