Dry Core Bits - High-Speed Dry Core Bit for Granite/Eng. Stone

Alpha Professional Tools® introduces a Dry Core Bit designed for use on the job site without using water. Our Dry Core Bits fit on a high-speed angle grinder with a 5/8" -11 spindle. The Alpha® Dry Core Bit provides the best cutting performance and can drill through the toughest 1-1/4" granite, engineered stone, porcelain and crystallized glass countertop at the job site without using water. Not only is this convenient but it also increases productivity by cutting down on the amount of clean up needed when using water. Available in 1/2", 3/4", 1", 1-1/4", 1-3/8", 1-1/2" and 2" sizes. Choose the Alpha® Dry Core Drill Bit where the convenience of dry application is essential.


  • Designed for Jobsite Drilling of Faucet-Mounting Holes in Countertops and Vanities
  • Very Fast Cutting On Granite/Quartzite and Engineered Stone
  • Convenient Dry Application
  • High-Quality Aggressive Core Bit
  • Make Clean Rounded Corners for Square or Rectangular Sinkholes
  • Versatile and Adaptable in Many Industries for Water, Gas and Electrical Piping
  • Fits On Most Popular High-Speed Grinders

Part No. Diameter Maximum RPM Arbor(s)
DRB00500 1/2" 12,000 5/8"-11 Threaded
DRB00750 3/4" 12,000 5/8"-11 Threaded
DRB01000 1" 12,000 5/8"-11 Threaded
DRB01250 1-1/4" 12,000 5/8"-11 Threaded
DRB01375 1-3/8" 12,000 5/8"-11 Threaded
DRB01500 1-1/2" 12,000 5/8"-11 Threaded
DRB02000 2" 12,000 5/8"-11 Threaded