TiN Coated 4-Flute End Mill Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials. Titanium Nitride (TiN) is a multi-purpose coating which increases chip flow in softer materials. The heat and hardness resistance allows the tool to run at higher speeds than uncoated tools. Center Cutting tools have one or more cutting edges at the tip and are used in a variety of applications including plunging, drilling or ramping. Features include... 5/16" Mill Diameter 1-1/8" Length of Cut 5/16" Shank Diameter 3" Overall Length 4 Flutes 30° Helix