Carmex Thread Mills Solid Carbide - With Through Coolant - NPTF - 1/2 - 3/4 x 14 - MT7Introducing Carmex MTB solid carbide thread mills with through coolant, engineered for precise NPTF internal threads on 1 2"3 4" diameters (14 TPI). The MT7 shank delivers rigid, repeatable performance in demanding production environments. Thread Form and Size: NPTF threads for 1 2"3 4" major diameter with 14 threads per inch (14 TPI). Through Coolant Bore: Coolant is delivered through the tool bore to the cutting edge, enhancing chip removal and