[Tungsten Carbide]: Carbide tipped blade has great hardness, good wear resistance, sharp cutting edge, and long service life. Carbide tipped hole cutter can last 10X Long Life over a standard bi-metal hole saw. [Proved Design]: Precision ground teeth ensures a fast cutting, and a clean & round hole. Safety stopper prevents the operator from drilling beyond the sheet metal. Speical oxided coating offers exceptional performance specifically for drilling through metal. [Smooth Cutting]: Split pilot drill bit prevents bit walking and damage to the cutter. The double helix grooves design of the bit ensures a faster start. The innovative ejector spring makes the slug to remove easily.Comes with Quick change 1/4 inch hex shank for quick cutter switches and compatible with lithium electric power tools [Wide Application]: Perfect for drilling on hard metal, such as stainless, iron, copper, aluminum, and plastic; Note: CAN NOT be used for drilling on concrete, tiles, and stone. [Operation Tip]: Always keep the hole cutter flat on the sheet metal. Please use the recommended RPM for extending the service life. Carbide Hole Saw-1"-Black