HIGH QUALITY MATERIALS: Our step drill bit is made of high-speed steel and provides fast, comfortable, friction-free drilling; a small case for easy storage and carrying. Titanium Coated: The paring bit with titanium coating provides good resistance to corrosion, heat and rust; reduces friction and heat; for longer life even in extreme temperatures. 13 drill sizes: for different hole sizes, you only need a step drill; 13 sizes are on the stepped drill for your convenience: 5 mm, 7 mm, 10 mm, 12 mm, 15 mm, 17 mm, 20 mm, 22 mm, 25 mm, 27 mm, 30 mm, 32 mm, 35 mm. Fast drilling: the design of the double blade provides faster, frictionless cutting. Please note that while working the step drill, pour water to cool the step drill; the service life of the HSS step drill bit will be effectively extended. Material: The taper drill bit is suitable for household repairs and light work such as drilling holes in plastic, copper, aluminum and many others types of sheets; but not suitable for stainless steel. Features: The HSS step drill bit made of high speed steel and with double cutting blades offers faster drilling, comfortable and without friction. With a titanium coating, the Step Drill offers good resistance to corrosion, heat and rust. Even at extreme temperatures, the titanium coating guarantees a longer service life. For different hole sizes, you only need a step drill bit, to repair the house and work easily. During the work of the drill, pour water to cool the step drill. Drilling holes in plastic, copper, aluminum and many other types of sheet metal, but not suitable for steel stainless steel. Find out more about our product: Technical data: Inseam: 5mm, 7mm, 10mm, 12mm, 15mm, 17mm, 20mm, 22mm, 25mm, 27mm, 30mm, 32mm, 35mm. Material: High Speed Steel Note: The data is manual measurement, please allow 1-123cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.