Carmex Thread Mills Mini Type - For Hard Materials - Metric - M3.5 x 0.6 - MT9Carmex's Mini Type thread mill is a purpose built solid carbide tool for precision internal threading in hard workpieces. Designed for machinists and shop floors that machine hardened materials, it delivers consistent threads, improved cutting performance, and a superior surface finish. Tool type: Mini Type solid carbide thread mill engineered for threading in hardened materials. Thread size: Metric M3. 5 x 0. 6 thread geometry for compact, precise