Carmex Thread Mills Solid Carbide - For Aluminium - UN (UNC UNF UNEF UNS) - No. 8, No. 10, No. 12 x 32 - UnCoatedThe Carmex AMT Solid Carbide Thread Mills are precision tools designed for high speed aluminum threading. Built for machinists and shops that demand clean internal threads in UNC, UNF, UNEF, and UNS forms, these mills deliver reliable, repeatable results with every cut. Material: Solid carbide for exceptional rigidity and wear resistance in aluminum machining. Coating: Uncoated cutting edges that provide a sharp, consistent cut and predictable finish.