The double bottom drill bit is suitable in turns on lathe digs the drilling machine to sneak in the surface silt and the rich water and soil, is suitable specially for the montmorillonite clay. The double bottom drill bit may use in sneaking in the silt, the granulated sugar and the sand body, may also replace the flat keel drill bit to sneak to the soil layer. The drill bit base and uses the large diameter high strength bolt attachment by the assembly joint pin belt lift hook's dead plate to fight tooth's removable bottom in the above belt to be composed the constitution, therefore named double bottom drill bit. The characteristic is the drill bit stopping property is good, the use stratum was more widespread, promotes the drill rod to carry on the reverse to close the putty mouth ahead of time.

It is suitable for Bauer Germany or Sany Drilling machines!!