Diamond Core Drill Bit for Porcelain/Gres GEKO 150 mm (25 mm arbor)

The Diamond Core Drill Bit for Porcelain/Gres GEKO 150 mm (25 mm arbor) is a wet-cutting diamond core designed for drilling large clean holes in hard ceramic surfaces such as porcelain stoneware (gres). With a 150 mm cutting diameter and a 25 mm arbor connection, the bit is intended for use with drills that support wet core drilling and provide stable rotation. It is suitable for creating openings for fixtures, plumbing, electrical conduits, and other penetrations where precision and minimal chipping are required.

Advantages

This GEKO diamond core bit delivers accurate circular cuts with a continuous diamond-segment rim that reduces chipping on delicate glazed surfaces. The wet-drilling design helps control dust and heat, extending the life of the tool and improving cut quality. The 25 mm arbor interface provides a secure connection to compatible core drill adapters or drill spindles, enabling stable operation on suitable drill rigs or handheld drills equipped for core drilling.

Suitable for

• Drilling clean holes in porcelain stoneware (gres) and similar hard tiles
• Installing bathroom and kitchen fixtures where precise tile penetrations are required
• Creating openings for plumbing pipes, drainage, and electrical conduits through tiled surfaces
• Professional tiling and renovation projects that require wet core drilling techniques

When it may not be suitable

This core drill bit is designed specifically for wet drilling in hard ceramic materials; it is not intended for dry drilling applications. It may not perform efficiently on softer materials such as standard ceramic wall tiles, wood, plastics, or thin porcelain where a smaller or different type of bit would be more appropriate. Using the bit without adequate water cooling, improper drill speed, or on unsupported substrates can lead to overheating, rapid wear, or breakage.

Key specifications

• Cutting diameter: 150 mm
• Arbor connection diameter: 25 mm
• Cutting type: diamond core, continuous rim for tile
• Intended drilling method: wet drilling
• Primary material application: porcelain stoneware (gres) and hard tiles

How to use

Mount the diamond core bit onto a compatible arbor or drill spindle with a secure 25 mm connection. Secure the workpiece and mark the drilling location. Start drilling with a low to moderate speed using a constant supply of water to the cutting edge to cool the diamond segments and remove slurry. Apply steady, even pressure without forcing the bit; allow the diamond rim to cut the material. After cutting through, withdraw the bit slowly while maintaining water flow to minimize chipping and flush debris.

What to consider before purchase

• Confirm that your drill or core adapter supports a 25 mm arbor connection and wet core drilling
• Ensure the 150 mm diameter is appropriate for the intended fixture or opening
• Verify that the target material is porcelain stoneware (gres) or similar hard tile suited for diamond wet drilling
• Plan for a water supply or coolant system compatible with your drilling setup

Usage recommendations

Use steady, controlled drilling speeds and continuous water cooling. Start the cut at an angle or with a pilot hole technique if needed to prevent slipping on glazed surfaces. Replace the bit when cutting performance decreases noticeably to maintain clean edges and safe operation.