Duro Bore
all soils bit
Designed for adverse geologies: cobbles,
fractured shales,
cobbles, caliche and compacted soils
11-18 degree steering angles.
Designed for long life in production drilling application.
Replaceable fluid nozzles.
Heat treated tool steel body - Resists abrasion!
Solid tungsten carbide cutting edges.
Available in 4", 5", 6" & 8" diameters.
| Part Number | Diameter (Inches) | Steering Flat | Threads |
| D279 | 4.0" | 12 Degrees | 2 API I.F. Pin |
| D208 | 4.0" | 12 Degrees | 2-3/8 API Reg Pin |
| D271 | 5.0" | 14 Degrees | 2-3/8 API Reg Pin |
| D211 | 6.0" | 11 Degrees | 2-3/8 API Reg Pin |
| D309 | 6.0" | 11 Degrees | 2-7/8 API Reg Pin |
| D206 | 6.0" | 11 Degrees | 3-1/2 API Reg Pin |
| D270 | 8.0" | 21 Degrees | 3-1/2 API Reg Pin |
| D257 | 8.0" | 18 Degrees | 4-1/2 API Reg Pin |
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"When the others can't make the cut!" 
Copyright © 1999 Geological Boring L.L.C. All rights reserved.
Revised: March 15, 1999.