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Alpha Wet Diamond Core Bits (3/8" - 2-1/2")
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At a Glance
Quick Decision Guide
Diameter
3/8"
Maximum RPM
3,500 RPM
Drilling Type
Wet
Thread
5/8"-11
Primary Materials
Granite & Engineered Stone
Common Application
Faucet & Utility Holes
Segment Type
Direct-Sintered Metal
Tool Compatibility
Water-Fed Polishers & Drills
Why Choose This Product
Key Benefits
Fast Wet Coring
Aggressive direct-sintered segments drill clean holes efficiently
Long Service Life
Brazed segment construction supports demanding coring applications
Broad Material Use
Drills granite, engineered stone, porcelain, marble, concrete and ceramic tile
Countertop Applications
Creates faucet holes and rounded corners for sink cutouts
Utility Penetrations
Drills openings for water, gas and electrical piping
Undercut Protection
Side-mounted diamond grit protects the steel core during free-hand drilling
Water-Fed Tool Fit
5/8"-11 thread fits compatible wet polishers and water-swivel setups
Seven Diameters
Available from 3/4" through 2-1/2" for different hole requirements
Product Information
Product Details
Specifications
Brand
Alpha®
Part Number
DCB00380
UPC
749173460326
Product Type
Wet Core Drill Bit
Diameter
3/8"
Maximum RPM
3,500 RPM
Drilling Type
Wet
Thread
5/8"-11
Segment Construction
Direct-Sintered Metal Segments Brazed to Steel Core
Primary Materials
Granite & Engineered Stone
Additional Materials
Natural Stone, Concrete & Ceramic Tile
Applications
Faucet Holes, Sink Cutout Corners & Utility Penetrations
Utility Applications
Water, Gas & Electrical Piping
Tool Compatibility
Water-Fed Polishers & Compatible Drills
Drill Press Use
Yes, with Water Swivel Attachment
Free-Hand Use
Yes, with Compatible Wet Polishing Tool
Water Requirement
Central Water Feed or Water Swivel Required
Compatible Alpha Tools
AIR-680, AWP-158 & VSP-320
About This Product
Wet Diamond Core Bits for Stone, Concrete and Tile
Alpha® Wet Diamond Core Bits provide fast, clean coring in granite, engineered stone, porcelain slab, marble, limestone, concrete, ceramic tile, and gypsum. Direct-sintered metal segments are brazed to the steel core for aggressive drilling and long service life, while vacuum-brazed diamond grit along the sides helps protect the core from undercut during free-hand drilling.
Faucet Holes, Sink Cutouts and Utility Penetrations
These core drill bits are designed for faucet-mounting holes in countertops and vanities, as well as rounded corners for square and rectangular sink cutouts. They can also create penetrations for water, gas, and electrical piping through installed stone, concrete, and ceramic tile.
5/8"-11 Core Bits for Water-Fed Tools
Each coring bit uses a 5/8"-11 thread and fits compatible central water-feed polishing tools, including the Alpha AIR-680, AWP-158, and VSP-320. The bits can also be used with a drill press equipped with a water swivel. Seven diameters are available from 3/4" through 2-1/2", with a maximum operating speed of 3,500 RPM.
Wet-Only Drilling with Free-Hand Guidance
Alpha Wet Diamond Core Bits must be used with a central water-feed tool or water swivel to keep the diamond segments properly cooled. For free-hand drilling, Alpha recommends securing a template over the workpiece and clamping scrap stone beneath it to guide the bit and reduce excessive chipping as it exits the backside.
Product Resources
Documentation & Downloads
Common Questions
Frequently Asked Questions
What materials can Alpha Wet Diamond Core Bits drill?
They are designed for granite, engineered stone, porcelain slab, marble, limestone, concrete, ceramic tile, and gypsum.
Do Alpha Wet Diamond Core Bits require water?
Yes. These diamond core bits are designed exclusively for wet drilling. Water keeps the diamond segments cool and helps prevent glazing and loss of cutting performance.
What are these wet core bits commonly used for?
Common applications include drilling faucet holes in countertops and vanities, creating rounded sink-cutout corners, and making penetrations for water, gas, and electrical piping.
What sizes are Alpha Wet Diamond Core Bits available in?
The currently listed models are available in 3/4", 1", 1-1/4", 1-3/8", 1-1/2", 2", and 2-1/2" diameters.
What tools are compatible with these diamond core drill bits?
The 5/8"-11 core bits fit compatible central water-feed polishers, including the Alpha AIR-680, AWP-158, and VSP-320. They can also be used with a drill press equipped with a water swivel.
Can Alpha Wet Diamond Core Bits be used free-hand?
Yes. They can be used free-hand with a compatible central water-feed tool. Alpha recommends securing a template over the workpiece to guide the bit and improve drilling stability.
How can backside chipping be reduced when drilling stone?
Clamp a scrap piece of stone beneath the workpiece before drilling. The scrap supports the material as the core bit exits and helps reduce excessive backside chipping.
What is the maximum operating speed?
All currently listed Alpha Wet Diamond Core Bits have a maximum operating speed of 3,500 RPM.
How thick of a material can these core bits drill through?
The core bits are 4" long and can drill through material up to approximately 4" thick when new.