Carmex Thread Mills Solid Carbide - Fast Type - With Internal Coolant Bore - UN (UNC UNF UNEF UNS) - 3/8 x 16 - MT8The Carmex Fast MT solid carbide thread mill is engineered for high speed internal threading, delivering precise 3 8 16 threads with dependable tool life. Designed for professional machinists and production shops, it combines a fast type geometry with an internal coolant bore to boost throughput on demanding threading tasks. Tool Type: Solid carbide thread mill with Fast MT geometry optimized for high speed threading Flute Count: Large flute count