Perfect Size: For precise drilling of different sizes from 5-35mm diameter, one drill can handle holes of different sizes. High Quality Materials: Made of high quality HSS, titanium coating ensures extreme durability, reduces friction and heat. The titanium drill bit is especially suitable for processing copper and aluminum parts / cast steel / spring steel / cast iron parts / iron and other metal materials. Easy to Drill: The marking hole position and double flute design make drilling faster and smoother, as well as precise drilling. Laser Cut: The dimensions are laser engraved into the metal so they will not wear out even after repeated use. Applicable Materials: Steel, brass, plastic, wood, copper, fiberglass, PVC, metal fin and aluminum. Every electrician/DIYer deserves it It is made from high quality HSS steel Drill through hard objects, easily like cutting butter Made of HSS steel It is a complex steel, containing tungsten, molybdenum, chromium, vanadium, cobalt and other