$ 110.40
$ 110.40
$ 98.13
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Brand
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Diameter
| Brand: Alpha |
Alpha® Dry Core Bits for Granite, Engineered Stone & Porcelain
Alpha® Dry Core Bits are designed for job-site drilling of faucet, soap-dispenser and air-gap holes in granite, engineered stone, porcelain and crystallized-glass countertops — without water. They thread directly onto a high-speed angle grinder with a 5/8"-11 spindle and use Vacuum Brazed diamond on the side of the barrel with undercut protection, giving aggressive cutting action and stable, clean-walled holes. The 4"-long barrel sets the maximum stone thickness a new bit can drill through.
Features
- Designed for jobsite drilling of faucet-mounting holes in countertops and vanities
- Very fast cutting on granite, quartzite and engineered stone
- Convenient dry application — no water, no slurry, minimal cleanup
- High-quality, aggressive Vacuum Brazed diamond construction
- Makes clean, rounded corners for square or rectangular sinkholes
- Versatile for water, gas and electrical piping pass-throughs
- Fits most popular high-speed grinders with a 5/8"-11 spindle
- Undercut protection on the side keeps drilling stable and easier
| Part No. | Diameter | Thread | Max RPM | UPC |
|---|---|---|---|---|
| DRB00500 | 1/2" | 5/8"-11 | 12,000 RPM | 749173461330 |
| DRB00750 | 3/4" | 5/8"-11 | 12,000 RPM | 749173461347 |
| DRB01000 | 1" | 5/8"-11 | 12,000 RPM | 749173460715 |
| DRB01250 † | 1-1/4" | 5/8"-11 | 12,000 RPM | 749173460722 |
| DRB01375 | 1-3/8" | 5/8"-11 | 12,000 RPM | 749173460739 |
| DRB01500 | 1-1/2" | 5/8"-11 | 12,000 RPM | 749173460746 |
| DRB02000 | 2" | 5/8"-11 | 12,000 RPM | 749173461354 |
- Select the Dry Core Bit diameter that matches your hole spec (1/2" through 2").
- Thread the bit fully onto a 5/8"-11 high-speed angle grinder spindle.
- Clamp a granite, engineered-stone or composite template on top of the workpiece, polished side toward the workpiece, to guide the bit.
- Start at a tilt to bite a crescent, then bring the bit upright once the kerf is established.
- Run between 6,000 and 12,000 RPM — never exceed 12,000 RPM and never run below 6,000 RPM.
- Use light, steady pressure; let the diamond do the cutting. Pause periodically to clear dust and cool the bit.
- Dry use is intended, but wet cutting is recommended whenever water is available — it extends bit life and reduces dust.
- Maximum drillable thickness equals the 4" barrel length when the bit is new.
1-1/4" — Dry Core Bit — DRB01250
| Part No. | DRB01250 |
| UPC | 749173460722 |
| Size | 1-1/4" |
| Type | Dry Core Bit |
| Thread | 5/8"-11 |
| Max RPM | 12,000 RPM |
| Recommended For | Granite, Engineered Stone, Porcelain, Crystallized Glass |
| Packaged Weight | 0.70 lbs |
| Package Dimensions | 6.25" x 1.75" x 1.75" |
| Commodity Code | 8207.19.3060 |
| Country of Origin | Japan |
1-3/8" — Dry Core Bit — DRB01375
| Part No. | DRB01375 |
| UPC | 749173460739 |
| Size | 1-3/8" |
| Type | Dry Core Bit |
| Thread | 5/8"-11 |
| Max RPM | 12,000 RPM |
| Recommended For | Granite, Engineered Stone, Porcelain, Crystallized Glass |
| Packaged Weight | 0.70 lbs |
| Package Dimensions | 6.25" x 1.75" x 1.75" |
| Commodity Code | 8207.19.3060 |
| Country of Origin | Japan |
| Property | Detail |
|---|---|
| Application | Dry (wet use also permitted) |
| Drive | 5/8"-11 Female Thread |
| Maximum RPM | 12,000 RPM |
| Minimum RPM | 6,000 RPM |
| Barrel Length | 4" (maximum drilling depth when new) |
| Diamond Technology | Vacuum Brazed with sintered segment and undercut protection |
| Materials | Granite, Engineered Stone, Porcelain, Crystallized Glass |
| Not Recommended For | Marble (too soft — dry-drill heat may crack the slab) |
| Country of Origin | Japan |
What materials can be core-drilled with Alpha® Dry Core Bits?
They are designed for granite, engineered stone and porcelain slab materials, and also work on crystallized glass.
Can I use the Dry Core Bits on marble?
No. Marble is too soft; the heat generated by dry drilling can crack the material.
Can the Dry Core Bits be used wet?
Yes. They are designed for dry use, but wet cutting is recommended whenever possible to extend bit life and control dust.
What is the maximum RPM for these bits?
Do not exceed 12,000 RPM.
What is the minimum recommended RPM?
Do not run below 6,000 RPM. Slow speeds cause polishing instead of cutting and shorten bit life.
Can I use these on a wet polisher?
No. Wet polishers run at roughly 2,000–4,000 RPM — too slow for Dry Core Bits. Use a high-speed angle grinder.
What kind of template should I use?
A template made from granite, engineered stone or composite. Secure it with clamps, polished side facing the workpiece, to guide the bit and prevent walking.
What stone thickness can these bits drill through?
Up to 4" when the bit is new — the barrel length is the limiting factor.
Why are there diamonds on the side of the core?
The side diamonds combined with the sintered segment and undercut protection make the drilling action easier, more stable and less prone to binding.
What sizes are available?
Six standard sizes ship from the factory: 1/2", 3/4", 1", 1-3/8", 1-1/2" and 2". A 1-1/4" option (DRB01250) is also stocked at DST.
Angle Grinder with Dry Core Bit
How to Cut Internal Corners
Angle Grinder with Dry Core Bit on Granite
How to Work on Porcelain Paver Tiles
⚠ WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. Always wear appropriate PPE.