Perfect Size: For precise drilling of different sizes from 5-35mm in 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: Marking hole position and double flute design make drilling faster and smoother, precise drilling. Laser Size: Dimensions are laser engraved into the metal so they won't wear out even after repeated use. Applicable materials: steel, brass, plastic, wood, copper, fiberglass, PVC, metal fin and aluminum. Every electrician/handyman 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 (around 500°C), and HRC>60 Perfect size For precise drilling of different sizes from 5-35mm diameter , a drill can handle holes of different sizes. Easy to drill Marking hole position and double flute design make drilling faster and smoother, precise drilling Applicable materials steel, brass, plastic, wood, copper, fiberglass, PVC, metal and aluminum fin please remember to protect your hands when you use it. This product is not for sale to children.