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Diamond core bits are essential tools for any professional tiler. Whether you're working with wall tiles, porcelain stoneware, natural stone, or granite – clean, precise, and material-friendly drilling requires specialised tools you can rely on in everyday site work. The Karl Dahm online shop offers a wide range of high-quality diamond core bits for both dry and wet cutting, including the latest MATRIXTEC technology and well-thought-out core bit sets.
Precision, durability, and versatility define our diamond core bits. Thanks to industrial-grade diamond segments, they ensure precise drilling without chipping – even on delicate surfaces like porcelain stoneware or glazed tiles.
Another advantage: our core bits are designed specifically for professional tradespeople. They impress with:
High drilling speed and long service life
Clean edges and minimal heat build-up
Compatibility with angle grinders, cordless screwdrivers, or drilling rigs
Water feed or paraffin cooling options for dust-free drilling
It's not just about diameter or mounting type – what really matters is that the core bit is optimally suited to the material. Our range includes various segment heights, coatings, cooling technologies, and connection types.
Dry core bits are ideal for mobile applications or indoor use without water supply. Particularly popular: the Gold Edition with M14 connection – suitable for use with angle grinders. These bits easily cut through hard materials like porcelain stoneware, natural stone, or marble.
Thanks to their thin-walled design, they operate especially quickly and efficiently. An integrated wax cooling system in the drill segment helps regulate temperature and protect the diamonds. Typical diameters range from 6 to 120 mm – ideal for socket drilling, water connections, or special applications.
The M14 threaded connection allows for fast mounting on common angle grinders. Models with paraffin cooling or bit connections are also perfect for cordless screwdriver use.
A highlight is the dry core bit set Art.-No. 50234, which bundles six of the most common diameters in a practical transport case. The diamond segments provide reliably precise results – even on tough wall tiles or natural stone.
For sensitive or very hard materials, we recommend wet cutting with continuous water cooling. Karl Dahm wet core bits are ideal for porcelain stoneware, tiles, granite, or glass.
With the matching KDB-200 drill stand (Art.-No. 40103), serial drilling can also be carried out with precision and efficiency. Thanks to the integrated water tank and pump, the core bit remains constantly cooled throughout the application. This protects the material from stress cracks and significantly extends the bit’s service life.
Our Bohrmeister series offers outstanding performance and is equipped with an R 1/2" thread for stationary drilling systems. Diameters up to 130 mm are possible – ideal for large-format panels or bathroom renovations.
Another popular wet core bit set is Art.-No. 50101, consisting of five different diameters and the proven sharpening stone (Art.-No. 20050) for diamond reactivation – ideal for regular use on job sites.
The latest innovation in dry drilling is MATRIXTEC. These core bits feature a high-density diamond matrix for particularly even drilling results and maximum service life.
Ideal in combination with an angle grinder or cordless screwdriver – for drilling in porcelain stoneware, natural stone, ceramic, or hard composite materials. A standout feature is the controlled drilling behaviour: MATRIXTEC significantly reduces vibration and improves cutting control.
A proven example: the MATRIXTEC core bit set Art.-No. 50841, consisting of several diameters including a stainless-steel pilot guide. This technology is especially valuable in professional interior construction or kitchen installations.
If you regularly need multiple diameters or want to be prepared for various job site scenarios, our core bit sets are the perfect choice.
Whether the Gold Edition in a practical case (e.g. Art.-No. 50234) or the MATRIXTEC Set (e.g. Art.-No. 50841) – most sets contain 6 to 8 common diameters. Many include a stainless-steel pilot guide or a cooling gel system for dust-free work. Sets with bit connections and paraffin cooling for cordless screwdrivers are also available.
The Art.-No. 50330 set, for example, combines innovative paraffin cooling with a simple bit connection. Perfect for both DIYers and professionals. Cooling gel (Art.-No. 50368) helps minimise dust and cool the core bit during operation.
Not sure which core bit is best for your material? Our expert advisers are happy to help by phone at +49 8667 878-0 or by email at info@dahm-werkzeuge.de. You can also send us a sample of your material – we’ll find the perfect solution for your needs.
Take advantage of our fast shipping: order by 2 p.m. on weekdays and your goods usually leave our warehouse the same day.
Dry core bits are perfect for precise drilling in hard tiles, porcelain stoneware and ceramics – completely without water cooling. They can be used flexibly with an angle grinder or cordless drill, making them ideal for renovations, installations and job sites without water access. Thanks to their high cutting performance, dry core bits create clean drill holes with minimal effort.
Wet core bits work with continuous water cooling, which reduces heat build-up and protects the material. This keeps sensitive surfaces such as marble, natural stone or glass free from stress cracks and chipping. At the same time, water cooling increases the lifespan of the diamond segments and ensures exceptionally clean cutting edges – ideal for high-quality tile work.
Thanks to their special diamond matrix, MATRIXTEC core bits ensure particularly uniform material removal and extended service life. They reduce vibrations, improve control and deliver accurate results – even in extremely hard materials such as porcelain stoneware or technical ceramics. This makes them ideal for professional craftsmen who value precision and efficiency.
For mobile use without mains power, diamond core bits with a ¼" bit shank are perfect. These models can be clamped directly into standard cordless drills and allow precise drilling in tiles, drywall or wood. An adequately powerful cordless drill is important to achieve clean, chip-free hole edges.
Paraffin inside diamond drill heads melts during drilling and cools the segment from the inside. This reduces friction, prevents overheating and increases the core bit’s lifespan. Especially in dry drilling, paraffin provides gentle lubrication and noticeably easier handling with clean results.
Diamond core bits can easily be reactivated with a special sharpening stone. Deposits are removed and embedded diamonds are exposed again. This restores full cutting performance and significantly prolongs tool life. Regular sharpening is especially worthwhile for frequent professional use.
Most diamond core bits are designed for a drilling depth of around 60 mm. Extensions or special deep-drilling core bits are available for greater depths. For deep drilling, a stable drill stand and sufficient cooling are recommended to prevent material damage and ensure precise results.
A diamond core bit set includes several standard sizes and often useful accessories such as drilling guides or carrying cases. This provides flexibility and saves money compared to buying individual bits. Sets are particularly practical for tilers, installers and DIYers who need to be ready for different drilling tasks.
Edge drilling is no problem when using a stable drilling guide. Slow, controlled drilling helps prevent chipping or breakouts. High-quality diamond core bits ensure clean results even in critical edge areas.
For drilling holes for flush-mounted electrical outlet boxes, 68 mm or 70 mm core bits are commonly used. These are available in both dry and wet versions. The choice depends on the material and desired surface quality.
Karl Dahm diamond core bits are versatile: they fit angle grinders with an adapter, R 1/2" drills, cordless drills with bit shank and special drill stands such as the KDB-200. This makes them suitable for all job site situations – from quick use to high-precision drilling.
The KDB-200 is a stable professional drill stand with integrated water cooling for consistently clean and precise drilling. It is ideal for serial drilling, hard materials and accurate work without slipping or jamming – perfect for professional tilers.
For sensitive materials such as glass, mosaic or polished surfaces, special fine-grain diamond wet core bits are used. Water cooling prevents stress cracks and chipping. This keeps delicate surfaces undamaged and visually flawless.
Diamond core bits should always be stored dry, clean and shock-protected. Carrying cases or storage boxes prevent corrosion and damage to the diamond segments. Proper storage significantly extends their lifespan.
If the core bit feels dull, a sharpening stone usually restores cutting performance by exposing fresh diamond particles. If performance does not improve, the segment should be replaced or the core bit renewed. Regular maintenance ensures consistently clean drilling results and long tool life.
Trust Karl Dahm – for precise results, durable tools, and professional support.
