Carmex Carbide Groove Mill With Internal Coolant - 4mm x 1.00mmMeet the Carmex Carbide Groove Mill with Internal Coolant a precision cutting tool designed for internal and external grooving tasks. Built for machinists and production environments that demand clean grooves, repeatable results, and reliable performance under demanding conditions. Material: Solid carbide construction delivers high stiffness, wear resistance, and long tool life in a variety of materials. Internal coolant: Integrated coolant channels