TiAIN Coated Roughing End Mill Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys. Titanium Aluminum Nitride (TiAlN) has a higher hardness and oxidation temperature versus TiN and TiCN. As a result, it is particularly advantageous for higher speed operations in a variety of steel machining applications. Best for heavy cuts, cerntercutting for plunge cuts, deep slotting & pocketing applications. Excellent in all steels, and nonferrous materials. Features include... 5/8" Mill Diameter 5/8" Length of Cut 5/8" Shank Diameter 2-3/4" Overall Length 4 Flutes 30° Helix