Concentric Drill Bit

  • Brand: Guangjing
  • Place of Origin: Guangzhou, China
  • Material: Synthetic diamond + metal alloy
  • Place of Origin: Guangzhou, China
  • Production process: metallurgical sintering
  • Application: Concrete pile foundation, cement column pile
Product Details


“Guangjing brand” concentric drill bit, with 40-year reputation guarantee, is produced with high-purity industrial diamonds and high-strength aviation alloys. Testes with over 120 drilling rigs, it is proved that the drill bit is a best option for sampling and coring of concrete pile foundations of high-rise buildings.

Inner Diameter(mm)GradeLifespanSpeedConcrete Grade
10183Red, optimized for life span150~180 meter10~15 minute per drillC30,C35,C40
10183Golden, optimized for speed110~140 meter7~12 minute per drillC30,C35,C40