Material: Made of quality HSS steel and coated with Titanium, to reduce friction and heat. The centering punch is made of impact-resistant alloy steel and its service life is increased tenfold . Convenient for positioning before drilling and breaking windows to escape. Titanium coating allows for effortless cutting of steel plate, aluminum sheet , copper, plastic and wood panels. It can automatically deburr holes to keep the drill clean. 47 Sizes in 5: Bitset contains five standard drill bits that can replace 47 individual drill bits. 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 drill bit hole cutter, made of high quality HSS steel, titanium coated 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 bit from slipping; The blade features a double-edged design for faster, more frequent cutting. Protective packaging: A packing insert is inside the drill box to prevent slipping. 39;damage in transit. Automatic center punch Center punch provides automatic high-impact 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 not easy to dull