Carmex Thread Mills Solid Carbide - With Through Coolant - UN (UNC UNF UNEF UNS) - 3/8 x 16 - MT7The Carmex MTB Solid Carbide Thread Mill with Through Coolant is engineered for precision internal threading in UNC UNF UNEF UNS standards. Designed for CNC operators who demand reliable performance and longer tool life, it delivers sustained accuracy in a compact, rigid package. Through coolant bore: coolant fluid runs through the tool to flush chips from the hole and cool the cutting edges, enabling smoother threading and cooler operation. Solid