Carmex Thread Mills Solid Carbide - Fast Type - For Hard Materials - Metric - M3, M4, M5 x 0.5 - MT3Engineered for precision internal threading in hard materials, Carmex MT3 Solid Carbide Fast Type Thread Mills deliver reliable metric threads in M3, M4, and M5 sizes with 0. 5 mm pitch. Designed for demanding applications, this tool packs stability and durability for challenging metals and alloys. Thread sizes: Metric internal threads in M3, M4, and M5 with 0. 5 mm pitch. Material: Solid carbide with MT3 shank for high rigidity and long tool life in