Bihui 20mm Vacuum-Brazed Diamond Dry Drill Bit

The Bihui 20mm Vacuum-Brazed Diamond Dry Drill Bit is a professional-grade, high-speed rotary accessory engineered specifically for drilling pristine, medium-diameter clearances in the hardest wall and floor coverings. Shifting from smaller anchor shanks to an angle-grinder platform, this heavy-duty core bit features an integrated M14 thread designed to withstand the extreme thermal demands of high-RPM dry cutting. It is highly recommended for tilers, plumbers, and electrical installers who need to bore precise holes for copper pipework, incoming utility feeds, structural bolts, and heavy-duty bathroom fittings through dense porcelain and natural stone.

Why Choose the Bihui 20mm Brazed Diamond Dry Drill Bit?

• Direct-Fit M14 Threaded Connection: Engineered to spin directly onto the spindle of standard 115mm or 125mm high-speed angle grinders. This rigid, direct mechanical layout eliminates the need for chuck keys or separate mandrel adapters, delivering total concentricity and zero-wobble freehand drilling at speeds up to 11,000 RPM.

• Vacuum-Brazed Core with Lubricating Wax: Manufactured using advanced vacuum-brazing metallurgy, which molecularly fuses premium industrial diamond grit directly to the cutting rim. The core is packed with a specialized internal cooling wax that liquefies during operation to control friction heat, ensuring a long tool life without water.

• Integrated Debris and Dust Discharge Holes: The steel cylinder body is engineered with specialized lateral dust slots. This layout allows waste fragments, stone powder, and core plugs to discharge dynamically during the cut, preventing the bit from binding or overheating inside deep holes.

• Professional Angled Entry Start: To achieve micro-precise hole placement without a pilot bit, simply introduce the cutting edge to the tile surface at a calculated 45° angle to create a starting groove, then gradually upright the grinder to a 90° positioning to finish the plunge cleanly.

• Flawless Multi-Substrate Application: Built to slice through dense vitrified glazes and igneous stones effortlessly, this robust 20mm hole saw delivers immaculate, chip-free boundaries across:

  • Dense porcelain floor tiles and ultra-thin large format slabs

  • Heavy natural stone panels, including granite, quartzite, and travertine

  • Luxury polished marble, limestone, and architectural ceramics

Technical Specifications

• Brand: Bihui

• Product Type: Professional Dry Diamond Core Bit / Hole Saw

• Hole Cutting Diameter: 20 mm

• Mounting Connection Type: Industry-Standard M14 Female Thread (Direct Angle Grinder Fit)

• Manufacturing Bond: High-Performance Vacuum-Brazed Diamond Matrix

• Cooling Mechanism: Integrated Internal Cooling Wax Core & Lateral Dust Discharge Holes

• Maximum Safe Operating Speed: Supports up to 11,000 RPM

• Recommended Substrates: Porcelain, Ceramics, Granite, Marble, Quartz, and Sintered Stone

Buy online today for fast nationwide delivery across Ireland, or select Click & Collect to pick up your order directly from our Limerick showroom.