1、Premium Quality -- Made from high quality HSS steel; Heat treated and highly polished ensures outstanding durability and sharpness, cut more smoothly, can reduces the friction, runs cooler hence lengthening the service life. 2、High Performance -- Ideal for Deburring, Chamfering, Cutting or expanding perfectly round holes in a variety of materials including steel, wood, plastic, etc. 3、Wide Compatible -- The hex 1/4inch shank is better clamped on the Pistol drill, Hand drill, Charging drill, Bench drill to prevent slippage and shedding during the rotation. 4、Meet Your Demands -- With the versatile step drill bit, you can process different kinds of diameter holes, which greatly saves you a lot of trouble. Great for steel sheets/ aluminum sheets/ copper/ plastic/ wood board and many other types of sheet metal with ease countersunk. 5、Wide Application -- Suitable for Home DIY, and General Building/ Engineering Use.