The step drill set contains five standard HSS step drills, which can replace 50 individual drills. One drill can be used as a replacement for multiple drill bits to meet different requirements. With the five piece step drill bits we have offered, you can work 50 different types of diameter holes, saving you a lot of trouble and space. The split point tip is 135 degrees to increase the cutting speed with self-centreing and to prevent moving, which allows you to cut faster. The two-groove design also ensures faster and smoother cutting. And it erases chips faster, makes the material particles easily escape for a much cleaner drilling process. Only with low pressure, the step drill set can easily cut through most types of plates. The step drill has the three-sided shaft design. The design ensures your safety as it prevents the drill chuck from slipping and fits into the tool chuck. In addition, the shaft is small enough to fit any standard size chuck such as a small drill or a hand drill. Our step drill bits are made of HSS in combination with a titanium coating. These materials have the ability of oxidation resistance, no rust and wear. The high speed steel ensures this set has an excellent durability, works good and stays sharp for many years. The titanium coating conducts friction, runs cooler and makes it easy to drill multiple holes on surfaces such as plastic, aluminium, copper, stainless steel. The step drill set comes with five standard HSS step drills, which carry an exquisite aluminium case. All bits are neatly placed in a well-organised case. The case is easy to carry, store and protect the drill bits so as not to blunt them easily, which greatly extends the service life.