1, DTH drill bit 2, Factory supply 3, New and high quality 4, Made in CHINA. One piece DTH drill bit can use 3 months 110 Metal DTH Rock Drill Bits1, DTH drill bit2, Factory supply3, New and high quality4, Made in CHINA. One piece DTH drill bit can use 3 months 100x54x6, 110x54x6, 120x54x6, 130x54x6110x65x6, 130x65x6, 140x65x6110 Metal DTH Rock Drill Bits Picture: