1、WIDE APPLICATION: Impact drill bit can be used for operations on concrete, bricks, stones, gypsum, etc. 2、6 FLUTE DESIGN: Impact drill bit contains a 6 flute self centering cemented carbide tip, ensuring quick cutting speed and the longest possible service life. Good cutting capability, good low temperature impact toughness, and good overall mechanical qualities. 6 spiral maximizes drilling chip removal, which keeps the bit cool and increases its useful life. 3、CEMENTED CARBIDE MATERIAL: Made of premium cemented carbide material, the drill bit is strong and sturdy, wear and corrosion resistant, possesses great toughness, ensuring a long service life. 4、SPECIFICATIONS: Has a for SDS MAXIMUM interface, and 6 flute design, this drill bit is used for 18mm diameter holes. And the threaded part is 255mm, check for better work performance! 5、EASY CARRYING: Drill bit can be well stored and carried in your bag for convenient use with the help of the protective case, the thread is not easy to be damaged.