Carmex Carbide Groove Mill With Internal Coolant - 4mm x 0.5mmThe Carmex Carbide Groove Mill with Internal Coolant is a precision grooving tool designed for machinists who need clean internal and external grooves with dependable performance. Built from solid carbide and equipped with an integrated internal coolant system, it delivers durability and consistent results across a variety of materials. Material: Solid carbide construction for exceptional rigidity, wear resistance, and long tool life in demanding