These end mills cut channels with precise angles and dimensions, reducing the need for additional finishing. Also known as runner cutters. They have a ball-like profile and are specifically designed for creating modified trapezoidal or full round runners. They are not for general purpose contouring like standard ball end mills.

Made of solid carbide, these end mills are harder, stronger, and more wear resistant than high-speed steel and cobalt steel for the longest life and best finish on hard material. Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent the end mill from breaking. These end mills are uncoated, so they’ll stay sharper than coated end mills and leave a better finish on soft materials like aluminum. All are center cutting, allowing plunge cuts into a surface.