Designed for drilling granite and concrete;5/8 thread fits on polishers/ grinders;Lasting for dozens of holes depending on materials;use wet or dry;recomended speed 3000- 6000 RPM

• Toolocity SCB0212D 2-1/2-Inch Monster Dry/Wet Diamond Granite/Concrete Core Drill Bits/Hole Saws

Toolocity SCB0212D 2-1/2-Inch Monster Dry/Wet Diamond Granite/Concrete Core Drill Bits/Hole SawsApplied Diamond Tools