Square End Mill, 1.40 mm Milling Dia., Carbide, TiAlN, Non-Coolant Through The TiAlN coating on these end mills withstands high temperatures and protects them from wear. It allows the end mills to be used at faster speeds than end mills with a bright finish, and it resists cracks and oxidation better than TiN or TiCN coatings. Finishing end mills create a finer finish on the workpiece than roughing and roughing/finishing end mills. Miniature end mills have a smaller diameter and provide more precision and better control over material removal during detailed milling tasks than standard end mills. tem Square End Mill