The Ball End Mill from Ball is a high-speed steel end mill with a ball nose end. It has a 1/4" shank diameter, a 1/2" cutting diameter, and a 1-1/2" overall length. The end mill has a TiAlN coating for increased tool life and heat resistance. It is designed for general purpose milling in materials like aluminum, brass, bronze, and copper. The end mill can be run at speeds up to 11,000 RPM with feed rates up to 80 IPM. It is made in the USA by Ball, a manufacturer of precision cutting tools.