Clean, precise enlarged holes from any pilot hole size — built from aerospace-grade steel, available from 6" to 36" in diameter, with the most common sizes kept in stock for fast delivery.
A hole opener doesn’t drill new rock from surface — it follows an existing pilot hole and enlarges it to the final required diameter, in a single pass behind the original drill string. This makes hole opening the go-to method whenever a project needs a larger-diameter hole than the original pilot, without re-drilling the entire bore from scratch.
DKI’s DTH Hole Openers are built from aerospace-grade steel and engineered to maintain a clean, precise enlargement across a wide range of ground conditions, regardless of the original pilot hole diameter. Sizes run from 6″ (152mm) to 36″ (914mm), with our most popular stock sizes — 8″, 10″, and 12″ (203/254/305mm) — ready for fast delivery so projects don’t stall waiting on tooling.
Engineered to handle any pilot hole size, giving project planners flexibility in how the original bore was drilled.
Built to create true, clean holes across varied ground conditions, maintaining straightness through the enlargement pass.
Manufactured to the same quality standard as Drill King's full DTH Drill Bits range for consistent durability.
8", 10", and 12" (203/254/305mm) diameters kept in stock, minimizing lead time on the most commonly requested sizes.
6" to 36" (152–914mm) covers the large majority of hole-enlargement requirements across construction, water well, and mining projects.
Non-stock sizes and special configurations available on request for project-specific requirements.
| Specification | Detail |
|---|---|
| Diameter Range | 6” – 36” (152 – 914mm) |
| Pilot Hole Compatibility | Any pilot hole size |
| Materials | Aerospace-grade steel |
| Stock Sizes | 8” / 10” / 12” (203/254/305mm) for fast delivery |
| Manufacturing Standard | ISO 9001:2015, Made in the USA |
Need a hole opener sized for a non-standard pilot hole or larger final diameter? Contact our technical team to confirm configuration and lead time.
Enlarging pilot bores to final diameters for foundations and piling.
Reaming pilot holes to production well diameters.
Hole enlargement in production and development drilling.
Enlarging bores for geothermal loop and production installations.
Opening pilot bores for utility and conduit placement.
DKI’s standard hole opener range runs up to 36″ (914mm), with custom sizing available for larger project-specific requirements.
Yes — hole openers are matched to the original pilot hole diameter so the opener can follow the existing bore. Tell us your pilot size and target final diameter and we’ll confirm the right configuration.
8″, 10″, and 12″ (203/254/305mm) diameters are stocked for fast delivery. Other sizes are available but may carry a longer lead time.
DKI hole openers are built from aerospace-grade steel to perform across a wide range of formations; for especially abrasive or hard ground, talk to our technical team about wear-resistant configurations.
Tell us your pilot hole size and target diameter, and we'll confirm the right hole opener for your project — built to perform, engineered to last, made in the USA.
Built tough enough for the unpredictability of job sites, our equipment minimizes costly downtime and re-drills.
Every hole counts, and our tools are built to keep penetration rates high even in unpredictable, mixed formations.
Engineered for open-pit and underground alike, our tools lower per-meter drilling costs without sacrificing performance.
Engineered for the rigors of well-site conditions, our hammers and bits extend service life while reducing per-foot drilling costs.
Less downtime, fewer bit changes, more material moved. That's the Drill King difference for quarry operators who can't afford to slow down.
From residential wells to large-scale geothermal fields, our tools are trusted to get the job done right the first time
