Tapered drill bit with stepped profile for drilling 19 holes 4-32mm in place of 19 individual drill bits. Self-starting, no center punch required. Made of high quality white steel and coated with titanium for long life. Often used in sheet metal and general construction. A single drill can drill all the necessary holes in the countertop to speed up the installation of fixtures. Ideal for use in electrical work where thin steel, aluminum or plastic boxes and chassis are encountered. Finished holes can often be made very smooth and burr-free, especially in plastics. Automatically deburrs holes left by other drills, as the sharp increase in the next step size allows the cutting edge to scrape burrs from the entry surface of the workpiece. Save your time and effort.