Perfect size: For precise drilling of different sizes from 5-35mm in diameter, one drill can handle holes of different sizes。 High quality material: the titanium alloy liner is made of high quality HSS , which can ensure extremely high durability and reduce friction and heat. Titanium alloy drill bits are especially suitable for processing thin copper and aluminum workpieces / iron plates / wooden panels / plastic plates and other thin plate materials. Easy to drill: Marking hole position and double flute design make drilling faster and smoother, as well as precise drilling. Laser size: The dimensions are laser etched into the metal so they won't wear out even after repeated use. Applicable materials: plastic, wood, copper, iron, fiberglass, PVC, fin metal and aluminum。（≤3mm） Every electrician/handyman deserves it It is made from high quality HSS steel Drill the hard object, easily like cutting butters Made of HSS steel It is a complex steel, containing tungsten, molybdenum, chromium, vanadium, cobalt and others carbide elements It maintains a high hardness for cutting with high speed (about 500°C), and HRC>60 Perfect size For a Precise drilling of different sizes from 5-35mm in diameter, one drill can handle holes of different sizes. Easy to drill Marking hole position and design to double flute make drilling faster and smoother, precise drilling Applicable materials steel, brass, plastic, wood, copper, fiberglass, PVC, fin metal and aluminum caution remember to protect your hands when using it. This product is not for sale to children. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received Delivery Quantity: (according to the main image)