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A detailed buying guide: how to choose a diamond core drill.
This section covers diamond core drills — handheld and stand-mounted, for wet and dry drilling — for accurate round holes in concrete, reinforced concrete, brick, stone and asphalt when installing water, sewer, ventilation, gas and electrical services. Diamond drilling creates no impact load, does not crack the structure and leaves smooth hole walls. For diamond core bits, read how to choose a diamond core bit.
Handheld diamond drills suit holes up to about 130–160 mm, often dry drilling in brick and lightweight blocks. Stand-mounted rigs are designed for larger diameters (up to 250–350 mm) and reinforced concrete with wet drilling. Many motors can be used both handheld and on a stand. See differences between professional and household power tools.
Diamond core drills are usually rated at 1200–3900 W. The larger the core bit and the harder the material, the more powerful the motor needs to be. Check the manufacturer's maximum diameter separately for concrete and brick. See how to choose tool power (W).
Small core bits need high speed and large ones low speed, so drills with 2–3 mechanical gears are more versatile. The right speed extends core bit life and speeds up drilling. See what is rotational speed (RPM).
Stand-mounted rigs mostly use a 1¼" UNC thread, while handheld drills use M16, M18 or ½" connections. Make sure your core bits are compatible with the drill or choose a suitable adapter. See how to choose a concrete core bit.
In wet drilling, water cools the bit and flushes out slurry, which is essential for reinforced concrete, while dry drilling is used in brick with a vacuum extractor. The stand is fixed with an anchor or a vacuum base; vacuum suits flat, solid surfaces. Read wet vs dry diamond drilling and anchoring the stand.
Stand rigidity, column length and feed mechanism determine drilling accuracy and depth. A tilting stand (0–45°) allows angled holes, and a quick-release mount makes it easy to remove the motor for handheld use.
When working with water, a built-in or external portable residual current device (PRCD), safety clutch, soft start and overload protection matter. Also check the motor's protection against water. See how to choose electrical protection and switching devices and what is an IP rating.
Before drilling, make sure there are no cables or pipes in the wall, anchor the stand securely and never hold the drill by hand alone with large core bits. Wear safety glasses and hearing protection. Read essential power tool safety rules, how to choose safety glasses and how to choose hearing protection.
At ToolsArmenia you can compare diamond core drills by power, maximum core bit diameter, gears, connection type, wet or dry drilling and stand and choose the right model for your jobs.
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