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 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, steel, stainless steel, cast iron, and titanium. The ball nose end allows milling of 3D contoured surfaces.