Diamond Core Bit for Porcelain/Gres Silver KORONA 68 mm, model 12258

The Diamond Core Bit for Porcelain/Gres Silver KORONA 68 mm is a segmented diamond cutter designed to drill precise circular holes in hard ceramic surfaces such as porcelain and gres tiles. Optimised for wet drilling, the bit removes material efficiently while minimising chipping and providing a clean edge. It is intended for use with compatible rotary drills and angle grinders equipped for core bits and is suitable for trade professionals who need reliable performance when installing pipes, electrical boxes or fixtures.

Advantages

This core bit features a segmented diamond cutting edge that enhances cutting speed and prolongs life when working on dense ceramic materials. The design supports water cooling to reduce heat buildup and dust, resulting in smoother cutting and lower risk of glazing or thermal damage to the tile. Its 68 mm diameter allows consistent, repeatable hole sizes for standard installations and the robust construction gives stable performance under continuous use.

Suitable for

• Drilling holes in porcelain and gres tiles for plumbing penetrations
• Creating openings for electrical boxes, sockets and conduit in tiled walls
• Renovation and installation work where clean circular holes through hard ceramic are required
• Professional tilers, electricians and installers working with large-format or dense ceramic tiles

When it may not be suitable

This core bit is specifically made for hard ceramic materials like porcelain and gres; it may not perform optimally on soft tiles, natural stone types with variable composition, glass, or metal. Dry drilling is not recommended; without adequate water cooling the bit can overheat, wear prematurely or cause damage to the workpiece.

Key specifications

• Diameter: 68 mm
• Cutting edge: segmented diamond tip designed for hard ceramic
• Recommended cooling: water-assisted (wet drilling)
• Typical use: circular core drilling in porcelain and gres tiles
• Compatible with: drills or core drill adapters that accept this diameter and mounting type

How to use

Mount the core bit securely in a compatible drill or core drilling adapter according to the tool manufacturer’s instructions. Position the bit on the marked drilling point and start at low speed to establish the cut, using water flow to keep the tip cool and to flush out slurry. Apply steady, moderate pressure and avoid forcing the bit; allow the diamond segments to remove material naturally. After penetrating the tile, back the bit out slowly while maintaining water flow to clear debris. Inspect the hole edge and clean the surfaces before installing any fixtures.

What to consider before purchase

• Ensure a 68 mm hole suits the intended pipe, box or fixture dimensions
• Verify compatibility of the bit’s shank or adapter with your drill or core drilling tool
• Plan for wet drilling: access to water supply or a suitable cooling arrangement is required
• Consider tile thickness and substrate to confirm the bit’s suitability for the full installation depth

Usage recommendations

For best results use steady RPMs appropriate for core drilling in porcelain, maintain continuous water flow to the cutting edge, and secure the tile or workpiece to prevent movement. Replace the bit if cutting speed drops significantly or if segments show heavy wear to preserve hole quality and safety.