Material: Made of high-quality high-speed steel and coated with titanium to reduce friction and heat. The centering punch is made of impact-resistant alloy, which has a service life ten times that of steel. It is convenient to position before drilling and can avoid breaking windows. The titanium coating allows you to easily cut steel, aluminum, copper, plastic and wood. It can automatically clean the hole and keep the drill bit clean. 47 Size 5: The drill bit set contains 5 standard drill bits that can replace 47 individual drill bits. The centering punch provides automatic impact, strong and spring-loaded, and adjusts the bottle cap. 1/4 hexagonal quick release handle for easier tightening. This is the new HSS steel titanium drill bit, made of high-quality HSS steel, coated with titanium to reduce friction and heat. < p >It is very suitable for drilling holes in various materials, including steel, brass, wood, plastic, etc. Three-sided stem prevents tip slippage; blade features double-sided design for faster, more frequent cuts. Protective Packaging: Drill bits have padded interior to prevent damage during shipping. Automatic Center Punch< /p> The center punch provides a powerful, automatic spring impact when adjusting bottle caps; its brass body has deep grooves on the surface to prevent slippage; the carbide tip makes the center punch 10 times more durable than ordinary aluminum protective shells, making the tip less likely to become blunt