Carmex Thread Mills Solid Carbide - With Through Coolant - NPS - 1/4 - 3/8 x 18 - MT7The Carmex MTB Solid Carbide Thread Mills with Through Coolant are designed for precision internal threading on NPS forms, delivering cleaner threads and longer tool life for demanding machining environments. Built for machinists who value reliability and efficiency, this MTB tool leverages through bore cooling to streamline chip evacuation and cut temperatures. Through Coolant Bore: Coolant is fed through the bore to cool the cutting edges and flush