Carmex Thread Mills Solid Carbide - With Through Coolant - G (55 Degree) BSF BSP - G3/8 x 19 - MT7Carmex MTB Solid Carbide Thread Mills with Through Coolant are engineered for precise internal threading in BSP BSF applications. Built for machinists who demand reliable chip evacuation and longer tool life, this 55 thread mill delivers consistent threads and productive performance. Material: Solid carbide for rigidity, wear resistance, and stable cutting performance. Cooling method: Through bore coolant channels fluid directly to the cutting edges,