Material: made of quality HSS steel and coated with Titanium, to reduce friction and heat. The centering punch is made of shock-resistant alloy steel and its lifespan is increased tenfold . Convenient for positioning before drilling and breaking windows to escape. Titanium coating allows effortless cutting of steel sheets, aluminum sheets , copper, plastic and wood panels. It can automatically deburr holes to keep the drill clean. 47 sizes in 5: The bitset contains five standard drill bits that can replace 47 individual drill bits. The centering punch provides impact automatic, powerful and spring-loaded by adjusting the cap. 1/4 HEX quick release handle for easier tightening. This is the new HSS Steel Titanium Core Bit Hole Cutter, made of high quality HSS steel, coated with titanium for reduce friction and heat. Perfect for drilling holes in various materials including steel, brass, wood, plastic, etc. The valve stem three-sided prevents the drill bit from slipping; The blade features a double-edged design for faster, more frequent cutting. Protective packaging: A filler pad is inside the bit box to prevent damage. 39;damage during transportation. Automatic Center Punch The center punch provides high impact automatic spring strike through cap adjustment; its brass body has a deeply knurled surface for slip-free control; and the tip with the carbide tip makes the center punch 10 times stronger than normal, aluminum protective casing to make the tips difficult to dull