120mm diamond core saw for hard ceramics, stoneware, wet cutting, galvanized
Looking for a top-of-the-line tool that can handle even the toughest ceramic tile installation challenges? The 120mm Diamond Core Saw for Hard Ceramics (SKU: M22458) is a professional diamond drill bit designed for extremely precise and clean wet drilling. This high-performance core saw with a zinc-plated coating ensures long life, high corrosion resistance and perfect results without damaging sensitive surfaces.
Whether you are a professional ceramicist, a construction craftsman or a passionate DIYer, this 120 mm diamond core bit allows you to quickly, easily and with extreme precision drill larger diameter holes in the hardest materials such as stoneware, porcelain, terracotta and natural stone.
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Key benefits of using a 120mm diamond core saw

Extreme precision without damage: High-quality diamond segments enable smooth and clean cuts without chipping edges or cracking valuable ceramic tiles.
Extended service life with galvanized protection: A special galvanized coating protects the saw core from corrosion and rust, ensuring long-lasting use even in constant contact with water.
Efficient wet cutting: Designed for wet use, which allows for optimal cooling of the diamond grains, significantly reduces dust generation in the workplace and prolongs drill bit sharpness.
Smart material removal: Side openings on the saw body allow for quick and smooth removal of drilling debris and further contribute to effective cooling during work.
Universal Compatibility: With a standard clamping pin, the drill bit fits perfectly into most standard electric drills on the market.

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Technical specifications and features
To achieve the best results and a long tool life, it is crucial to follow the technical parameters and instructions for proper use:

Hole saw diameter: 120 mm – ideal for larger openings (e.g. for drains, pipes or boxes).
Clamping pin: A permanent pin with a diameter of approximately 9.5 - 10 mm, suitable for standard drill heads.
Diamond layer height: Approximately 4 mm high layer of high-quality diamond grains for stable cutting.
Maximum drilling depth: 26 - 28 mm.
Operating mode: Exclusively wet cutting (mandatory use of water or coolant).
Recommended operating speed: Maximum 300 - 500 revolutions per minute (rpm).
Drilling method: Rotary drilling without impact (be sure to turn off the impact function or hammer on the drill!).

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Instructions for safe and effective use
To achieve a perfect cut and prevent premature wear or damage to the diamond core bit, follow these steps consistently:

Surface preparation and cooling: Ensure a continuous flow of water to the cutting area before starting drilling. Water cooling is essential to prevent the diamonds from overheating.
Starting Drilling (at an Angle): Since the hole saw does not have a centering bit, start drilling at an angle of about 45 degrees to create a starting groove. Once the drill bit grips the material, slowly bring it back to a vertical position (90 degrees).
Pressure control: Do not apply too much pressure while working. Let the diamond grains do their work. Excessive pressure can cause mechanical damage to the drill bit or thermal overload.
No impact function: Drill only with an electric drill in non-hammer mode. Impact action would immediately destroy the diamond coating and damage the workpiece.

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Frequently Asked Questions (FAQ)
1. Can I use this core saw for dry drilling?
No. This diamond core bit is strictly designed for wet cutting. Using it without water or coolant will cause the diamond segments to overheat immediately, leading to permanent damage to the tool and inefficient drilling.
2. What materials can I drill with this 120mm diamond core bit?
The drill bit is extremely effective in drilling holes in hard ceramics, stoneware (porcelain stoneware), terracotta, brick, tiles and related mineral materials.
3. What drilling speed should I set on the drill?
Drilling should be done at low to medium speed, specifically between 300 and 500 revolutions per minute (rpm), with constant and abundant water cooling and without using the impact function.


Responsible persons:
MAR-POL - MAR-POL SCIMPORT EXPORT M.ŚCIANA, K.ŚCIANA, 26-020 Chmielnik, Suchowola 6a, Poland, obsluga@mar-pol.sklep.pl, +48607865357
Distributor for Slovenia: Haloorodje.si, Online Sales, Rok Groznik sp, Podturn 42, 8350 Dolenjske Toplice, info@haloorodje.si, +38669731944, Slovenia
Product origin: China

Instructions for using the product:
• Mount the saw on the cutting machine and tighten the mounting screws properly.
• Make sure that the cutting machine is properly set up for use with the saw and that all safety mechanisms are properly installed.
• Connect the water or coolant supply to the cutting machine and ensure that the water flow is uniform and sufficient to effectively cool the blade.
• Before starting cutting, check that the surface of the stoneware is clean and dry.
• Turn on the cutting machine and slowly start cutting the stoneware. Be careful not to press too hard as this may damage the blade or the surface of the ceramic.
• While cutting, regularly check that the cutting area is sufficiently moistened with water or coolant.
• After cutting, turn off the cutting machine and wait until the blade has completely stopped before removing the ceramic parts.

Useful tips for work:
• Always check that the cutting machine is correctly adjusted and functioning properly before cutting.
• Use appropriate personal protective equipment such as safety glasses, gloves and protective clothing.
• Regularly check the condition of the blade and clean and maintain it according to the manufacturer's instructions.
• Use the appropriate cutting speed and pressure to achieve the best results.
• Do not press too hard while cutting, as this may cause damage to the blade or the ceramic surface.
• After finishing cutting, clean the cutting machine and saw and store them in a safe place.

Warnings:
• CAUTION – use only with the appropriate power tool and without impact mode.
• This product is designed for hammerless drilling; do not use the impact function.
• Do not exceed the recommended speed of 300–500 rpm.
• Do not use a damaged or deformed crown.
• Do not press too hard, as this may cause mechanical or thermal damage to the crown or inlay.
• Water and power tools are a dangerous combination. Use only tools and equipment suitable for wet drilling and follow the instructions of the power tool manufacturer.
• Prevent water from entering the motor, switch, electrical connections or other parts that are not protected against water.
• Wear safety glasses, hearing protection and suitable gloves when working.
• When handling water and power tools, use a properly protected electrical circuit or protective device where required.
• Switch off and unplug the tool before changing the bit, cleaning or removing material residues.
• Do not touch the bit immediately after drilling – the metal parts can become very hot.
• Be careful of the sharp edges of the freshly drilled hole.

Same summary

The 120mm diamond core saw for hard ceramics and stoneware is suitable primarily for more demanding domestic or professional tasks where precision is required when wet cutting extremely hard materials. Choosing a diameter of 120 mm allows for efficient work on thicker tiles, but it also requires the right tool and experience in use. Due to its specialization, the product is not the best choice for very fine details or cutting thin ceramics, nor is it universal for all materials. Its zinc-plated surface extends its service life, but attention must be paid to the right choice of saw type according to the material and proper maintenance.

Recommendation source: Enaa guides and team experiences.

User view

Such diamond core saws are most often chosen by craftsmen and advanced home users who are undertaking bathroom renovations, laying floors or renovating rooms with hard ceramic or porcelain tiles. They are practical for projects where clean and straight cuts are important, and at the same time they make work easier on larger surfaces and more demanding work tasks. The saw is especially useful where you often encounter dense or extremely hard tiles, as standard saws often do not provide the appropriate precision or durability.

Users like to use the Mar-Pol brand because it is considered a proven tool manufacturer with an emphasis on practicality and solidity when working with hard materials.

Why buy at Enaa

In addition to a wide range of hole saws, Enaa also provides a quick overview of technical data and product comparisons, making it easier to make a choice based on your requirements and experience. Clear information is available, prepared by a team of experts, so you can quickly find the product that is right for your project.

Answers to frequently asked questions

For which materials is this diamond core saw particularly suitable?

The saw is primarily intended for cutting harder ceramic and porcelain tiles, where durability and efficiency in wet cutting are particularly important. For softer materials, it is recommended to choose a different type of saw.

Is it possible to mount a diamond core saw on conventional angle grinders?

The saw can usually be mounted on most standard angle grinders with the appropriate attachment, but check the shaft diameter and the tool manufacturer's recommendations before starting work.

What is the difference between wet and dry cutting with this saw?

Wet cutting reduces heat build-up and extends blade life, and also reduces the chance of damage to ceramic or porcelain tiles. For optimal results, it is recommended to consistently use water when cutting harder materials.

Is the saw also suitable for very thin ceramic or mosaic tiles?

Due to its larger diameter and design for hard materials, the saw is not the best choice for very thin or delicate tiles, where the use of a smaller, specialized hole saw is more advisable.

How is a diamond core saw maintained?

After each use, it is recommended to thoroughly clean the saw of any material residues and store it safely in a dry place, as this contributes to a longer blade life and safer use.

Description updated: April 2026