About this item.The tungsten carbide hole saw is an Useful alternative to the traditional bi-metal hole saw. They blow faster, cleaner and last longer. Try T.C.T. Hole Knife, you'll love it.Metal Drill Bits Tungsten blades cut through steel plate, iron, aluminum, copper, cast iron, and most importantly, stainless steel and other hard alloys.Metal Drill Bit Spring loaded pilot tip ejects cut slugs to save time. The cutter body then cuts a clean, burr-free hole faster than conventional twist drills or hole saws.T.C.T. Cutters are standard for electrical construction, transit work and general metal fabrication. The spring on the pilot bit ejects the slug.Drilling With normal maintenance, the tool life is much longer than other hole cutting tools. Inexpensive sharpening allows for repeated use.See more details.