【High-quality materials】 Classic high speed steel, titanium coating on the surface, proven performance and durability when drilling holes in plastic, wood, aluminum, copper, stainless steel and many other types of sheet metal. Titanium alloy drill bits are especially suitable for machining copper and aluminum parts / die steel / spring steel / cast iron parts / iron and other metal materials 【Easy to drill】 The spiral groove design with two slots prevents slipping, quickly removes chips and deburrs the hole, the pressure is small, drilling and cutting is faster and smoother; This can achieve faster, more stable and more uniform cutting. The hole can be automatically chamfered to clean the drill bit 【double cutting blade and three shafts】Double cutting blades and the X-shaped opening design ensure faster and more consistent cutting; The 3-sided shaft design can prevent the chuck from slipping. With the slightest pressure, the sets can cut through wood, sheet metal, steel and other