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 coating 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: The Marking hole position and double flute design make drilling faster and smoother, as well as precise drilling. Laser Size: Dimensions are laser etched into the metal so that they do not wear out even after repeated use. Applicable materials: plastic, wood, copper, iron, fiberglass, PVC, metal fin and aluminum3mm