TCT stands for Tungsten Carbide Tipped and it refers to saw blades that use Tungsten Carbide for the blade teeth. Tungsten Carbide is an incredibly tough material, able to be sharpened to a razors edge and durable enough to cut through new and reclaimed wood as well and mild steel, non-ferrous metals, plastics and composites when a suitably high grade of carbide is chosen. All Evolution TCT blades use Japanese sourced carbide teeth of the very highest quality that lasts longer and cuts sharper than lower quality grades.