Carmex Thread Mills Mini Type - For Hard Materials - UN (UNC UNF UNEF UNS) - No. 1, No. 2 x 64 - MT9Carmex Thread Mills Mini Type are solid carbide tools engineered for precision internal threading in hardened materials. Designed for machinists and shops dealing with tough alloys, these mills deliver reliable performance when you need clean, accurate threads in hard workpieces. No. 1 No. 2 Thread Mills: Compact, mini type tools sized for 64 mm overall length to access tight cavities while maintaining strong threading capability. Shank: MT9 Morse