Carmex Carbide Groove Mill With Internal Coolant - 12mm x 3.00mmPrecision focused solid carbide groove mill designed for internal and external grooving, built for machinists who demand clean grooves, tight tolerances, and reliable performance across a range of materials. The Carmex Groove Mill employs an internal coolant system to optimize cooling and chip evacuation, extending tool life in challenging conditions. Diameter x Groove Width: 12 mm diameter with a 3. 00 mm groove width for precise, consistent grooves.