Tungsten Carbide Tipped Cutters (TCT hole saws) are a superior alternative to conventional Bi-Metal Hole saws. TCT Hole Cutters cut into sheet metal, wood, and other materials with ease. As cutters, they are efficient as they cut the circumference of the hole Includes hole cutter, hex key, and pilot bit. These hole cutters have become the type to have at your disposal for cutting into metal. The hole saws make precision, accurate, clean round holes in metal & steel sheets. It used by metal fabrication experts and those who prefer the highest standard for their tools.