Countersink Core Bits

Countersink diamond core bits for creating recessed holes in granite, marble, quartz, and other stone surfaces. Countersink bits combine a pilot hole with a wider recess in a single operation, saving time when installing undermount sinks, flush-mount fixtures, and recessed hardware in stone countertops.

These bits are engineered for the specific demands of stone countertop fabrication, where precise hole depth and diameter matter for proper fixture installation. Use them on a drill press or core drill motor for consistent, repeatable results.

• Combines pilot drilling and countersinking in one step
• Designed for undermount sink clips and recessed hardware
• Works on granite, marble, quartz, and engineered stone
• Use with drill press or core drill for accurate depth control
• Saves fabrication time by eliminating multiple drilling steps

Speed up your countertop fabrication with countersink core bits that produce clean recessed holes in a single pass.