?Size? 4-12mm / 4-20mm / 4-32mm. Tapered tip with a step profile that is used to drill 19 hole sizes from 4-32mm to replace 19 individual drill bits. Self-starting, no drilling required. ?Material? Made of high quality HSS (High Speed Steel) 4241 and titanium coated for longer life. ?Application? Ideal for cutting holes in various materials including steel, sheet metal, wood, plastic, etc. This drill can meet your needs. ?Advantage? Automatically deburr holes left by other bits as the sharp increase to the next step size allows the cutting edge to scrape burrs from the workpiece entry surface. Good chip evacuation and even cutting save time and effort at the same time. ?Performance? The length of the unit and the ability to vary the finished hole diameter is an advantage when working with chassis or front panels. The finished hole can often be made particularly smooth and burr-free, especially in plastic. Product Feature: 1. No need for pilot drilling 2. Titanium coated to reduce