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, 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） Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain difference in color, the actual object received shall prevail.