Diamond Core Drill Bit 38mm 5/8-11 Welded Hole Saw for Granite Marble and Hard Stone Wet or Dry Use with Angle Grinder 10mm Diamond Height Grit 25/35 100mm Total Length Pro Grade Heavy Duty Faucet Mounting Hole Drill

38mm Diamond Core Drill Bit for Granite and Marble
✔️ Single-piece drill bit, 100mm length, 5/8-11 thread

This 38mm diamond core drill bit is designed for faucet mounting holes in granite, quartz, and marble countertops. It supports dry drilling on hard stone and wet drilling on other natural stone or concrete, with wet use extending segment life. Laser welded segments and vacuum brazed side protection ensure clean cuts and long life.

✅ Core diameter 38mm, total length 100mm, thread 5/8"-11, diamond height 10mm, grit #25/35
✅ Wet or dry drilling for granite, marble, quartz; not for rebar/concrete
✅ Laser-welded segments with vacuum brazed protection for clean cuts
✅ RPM 6000 to 11000; use with angle grinder; water cooling prolongs life
✅ Black finish; ideal for faucet mounting hole cuts in countertops

💡 What is the best way to use a diamond core drill bit for hard stone countertops?

This handy bit performs best with proper technique and cooling.

• Keep the workpiece supported and let the drill bit do the cutting
• Use water or coolant during wet drilling to reduce heat
• Maintain a steady feed and keep RPM between 6000 and 11000 for clean cuts
• Avoid drilling into rebar reinforced concrete or solid concrete