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Alpha Dry Diamond Core Bits for Granite, Engineered Stone & Porcelain
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At a Glance
Quick Decision Guide
Diameter
1/2"
Drilling Type
Dry
Max Speed
12,000 RPM
Thread
5/8"-11
Material Compatibility
Granite, Quartzite, Engineered Stone, Porcelain & Crystallized Glass
Maximum Material Thickness
1-1/4"
Tool Compatibility
High-Speed Angle Grinders
Primary Application
Countertop, Vanity & Utility Openings
Why Choose This Product
Key Benefits
Dry Drilling
Creates openings without the water and slurry of wet drilling
Aggressive Cutting
High-speed design drills hard countertop and slab materials
Reduced Cleanup
Dry operation simplifies drilling on installed countertops and finished jobsites
Broad Material Use
Drills granite, quartzite, engineered stone, porcelain and crystallized glass
Grinder Compatibility
5/8"-11 threads fit compatible high-speed angle grinders
Multiple Applications
Creates faucet holes, sink corners and utility openings
Product Information
Product Details
Specifications
Brand
Alpha®
Part Number
DRB00500
UPC
749173461330
Product Type
Dry Core Bit
Diameter
1/2"
Drilling Type
Dry
Maximum Speed
12,000 RPM
Thread
5/8"-11
Maximum Material Thickness
1-1/4"
Compatible Materials
Granite, Quartzite, Engineered Stone, Porcelain & Crystallized Glass
Tool Compatibility
High-Speed Angle Grinders with 5/8"-11 Spindle
Countertop Applications
Faucet-Mounting Holes, Sink Cutout Corners & Other Openings
Utility Applications
Water, Gas & Electrical Piping Openings
Water Required
No
About This Product
Diamond Core Bits for Dry Countertop Drilling
Alpha® Dry Diamond Core Bits provide aggressive, high-speed drilling in granite, quartzite, engineered stone, porcelain, and crystallized glass. Designed for dry use, these core bits eliminate the water and slurry associated with wet drilling, simplifying countertop fabrication and installation work.
Faucet Holes, Sink Cutouts and Utility Openings
The bits create openings for countertop and vanity faucets, water lines, gas lines, and electrical routing. They can also form clean, rounded corners when preparing square or rectangular sink cutouts.
Core Drill Bits for High-Speed Grinders
Each size has a 5/8"-11 thread for compatible high-speed angle grinders and requires an operating speed between 6,000 and 12,000 RPM. Available diameters range from 1/2" through 2", while new bits provide a maximum drilling depth of 4".
Dry or Wet Drilling Guidance
Although developed for dry drilling, these diamond core drill bits can also be used wet, and Alpha recommends wet operation whenever practical. They should not be used on marble or with low-speed wet polishers that cannot meet the 6,000 RPM minimum operating speed.
Product Resources
Documentation & Downloads
Common Questions
Frequently Asked Questions
What materials can Alpha Dry Diamond Core Bits drill?
The bits are designed for granite, quartzite, engineered stone, porcelain, and crystallized glass. Alpha advises against using them on marble because heat from dry drilling may crack the material.
Do Alpha Dry Diamond Core Bits require water?
No. These core bits are designed for dry drilling, but they can also be used wet. Alpha recommends wet drilling whenever practical.
What tools are compatible with these core drill bits?
The bits have a 5/8"-11 thread for compatible high-speed angle grinders. They should not be used with low-speed wet polishers that cannot reach the required operating range.
What operating speed do the diamond core drill bits require?
The bits must operate between 6,000 and 12,000 RPM. Do not operate them below 6,000 RPM or above the 12,000 RPM maximum.
How deep can Alpha Dry Core Bits drill?
Alpha states that new bits can drill to a maximum depth of 4", which corresponds to the overall bit length.
Can these diamond core bits drill faucet holes?
Yes. They are designed for drilling faucet-mounting holes in countertops and vanities made from compatible materials.
Can the core bits be used when making sink cutouts?
Yes. The bits can create clean, rounded corners when laying out square or rectangular sink cutouts.
Can these core bits create utility openings?
Yes. Available diameters from 1/2" through 2" can create suitable openings for water, gas, and electrical routing.