Material: Made from high quality HSS steel and coated with titanium to reduce friction and heat. The center punch is made of shock-resistant alloy steel and has a ten times longer service life. Convenient for positioning before drilling and breaking windows to escape. The titanium coating allows effortless cutting of steel sheets, aluminum sheets, copper plates, plastics and wood. It can automatically deburr holes to keep the drill bit clean. 47 Sizes in 5: The drill bit set includes five standard drill bits, which can replace 47 individual drill bits. The center punch provides automatic, powerful, spring-loaded impact by adjusting the cap. 1/4 HEX quick release buckle for easier tightening. This is the new titanium HSS steel drill bit, made from high quality HSS steel coated with titanium to reduce friction and heat. Perfect for drilling holes in a variety of materials such as steel, brass, wood, plastic, etc. The three-sided valve stem prevents bit slippage. The blade features a