Solid Carbide Milling Bits Cardmatix solid carbide cavity milling bits provide better rigidity than high-speed tooling steel. The average life span of a carbide milling bit is 100,000 cavities. Compatible with PVC, PC, ABS, PET, PETG and other industry standard card substrates. These consumables are extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials. Other shaft diameters and cutting profiles are available upon request.