Carmex Thread Mills Mini Type - For Hard Materials - Metric - M3, M4, M5 x 0.5 - MT9Carmex Thread Mills Mini Type are solid carbide tools designed for machining hardened materials up to 62 HRc, delivering precise internal threads with a superior surface finish. With metric options M3, M4, and M5 x 0. 5 and an MT9 shank, they're built for high precision work in mold making, tooling, and other demanding applications. Material and construction: Solid carbide design engineered to cut hard materials up to 62 HRc, providing excellent wear