Perfect Size: For precise drilling of various sizes from 5-35mm in diameter, one drill can handle holes of various 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 Cut: The dimensions are laser etched into the metal so they wont wear out even after repeated use. Applicable materials: plastic, wood, copper, ironfiberglass, PVC, metal fin and aluminum Every electrician/do-it-yourselfer deserves it It is made from high quality HSS steel Drill hard objects, easily like cutting butter HSS steel It is a complex steel, containing tungsten, molybdenum, chromium, vanadium, cobalt and other carbide elements It maintains high hardness for cutting with high speed (about 500C), and HRC60 Perfect size For precise drilling of various sizes from 5-35mm in diameter, one drill can handle holes of various sizes. Easy to drill Marking hole position and double flute design make drilling faster and smoother, as well as precise drilling Applicable materials steel, brass, plastic, wood, copper, fiberglass, PVC, metal fin and aluminum attention Remember to protect your hands when using it.