This 24" Tri-Cone bit is an animal!
From the top
24" tri-cone bit-
18" tri- cone bit
28" hammer bit
18" hammer bite
Just for drilling through the upper hole.
Where I'm at, the larger drills down around 270' through all water tables.
The 18" goes to around 450' for the mine string.
Then a 12.5" for intermediate string and lastly, 8.5" the rest of the way which can go out to 17-19,000' TD