Selecting the right blade depends primarily on the material being cut (wood, metal, masonry, or plastic) and the required finish. For wood, a high tooth count (60-100 TPI) provides a smooth finish for cross-cutting, while a low tooth count (24-40 TPI) is better for fast ripping. For metal, ensure the blade is made of Bi-Metal or Tungsten Carbide Tipped (TCT) materials to handle heat and friction. Always verify the Arbor Size and Blade Diameter to ensure compatibility with your specific machinery.