Carmex Thread Mills Solid Carbide - Fast Type - For Hard Materials - Metric - M2.5 x 0.45 - MT3Carmex MT3 Solid Carbide Thread Mills, Fast Type, are precision tools engineered for hard material threading. The M2. 5 x 0. 45 metric threading size and MT3 shank make them ideal for production environments that demand reliable, repeatable internal threads in tough metals. Thread Size & Shank: Metric M2. 5 x 0. 45 thread profile with MT3 solid carbide shank for compatibility with common CNC setups Threading Type: Fast Type geometry designed to