Carmex Carbide Groove Mill With Internal Coolant - 7.8mm x 2.00mmThe Carmex Carbide Groove Mill with Internal Coolant is a precision grooving tool designed for machinists who demand clean, accurate grooves in a range of materials. Built for both internal and external grooving, it delivers reliable performance even in challenging conditions. Size: 7. 8 mm cutting diameter with a 2. 0 mm groove width for precise, narrow grooves. Material: Solid carbide construction provides exceptional rigidity, wear resistance, and