Carmex Thread Mills Mini Type - For Hard Materials - Metric - M10, M12 x 1 - MT9Carmex Mini Type Thread Mills are solid carbide tools engineered for precise internal threading in hardened materials. Designed for professional shops, these mills deliver clean, accurate threads and a superb surface finish even when working with tough metals. Tool material: Solid carbide construction for high rigidity, wear resistance, and long tool life in hard workpieces. Hardness capability: Specifically suited for machining hardened materials up