The Spectrum BZX Zenith is a dry diamond core drill built for speed and clean cutting across brick, block, concrete and natural stone. Available in 18 sizes from 22mm to 182mm with a 1/2in BSP female thread and 10mm diamond segments for long working life.
Size
Price
QTY
22mm
£39.45£47.34
28mm
£41.59£49.91
32m
£42.66£51.19
38mm
£44.80£53.76
48mm
£52.28£62.74
52mm
£56.56£67.87
65mm
£70.46£84.55
78mm
£87.65£105.18
91mm
£90.77£108.92
102mm
£106.39£127.67
107mm
£114.30£137.16
117mm
£119.22£143.06
127mm
£126.12£151.34
142mm
£134.61£161.53
152mm
£143.16£171.79
162mm
£179.52£215.42
172mm
£188.07£225.68
182mm
£191.34£229.61
The OX Spectrum BZX Zenith diamond core is Spectrum’s top-of-the-range dry coring solution, and it shows. Engineered specifically to cut faster and cleaner than the competition, this is the core you reach for when the job needs to be done right and you haven’t got time to faff around with a slower bit that wanders or glazes over. Whether you’re coring through engineering brick, dense concrete block or natural stone, the BZX Zenith handles it without complaint. The full size range runs from 22mm right up to 182mm, all on a standard 1/2in BSP female thread, so there’s a size for almost every common coring task on a typical commercial or domestic site.
The segment design is where this core earns its keep. Alternating depth side slots give the bit a more aggressive cutting action — they help clear debris from the cut and stop the segment from riding on its own swarf, which is one of the main reasons cheaper cores slow down mid-hole. Combined with a friction-reduced geometry and laser-welded 10mm diamond segments, the BZX Zenith holds its edge for considerably longer than a standard dry core. The laser welding isn’t just marketing language either. It means the segments are bonded with far more structural integrity than brazed alternatives, so there’s no risk of a segment departing the barrel at the worst possible moment. Always a concern with cheaper cores on harder materials.
Where the OX Spectrum BZX Zenith Performs Best
Electricians and plumbers will know the situation well — a clean, fast core through a brick wall without cracking the surrounding face. The BZX Zenith was built with exactly that kind of trade use in mind. It cuts cleanly enough to leave tidy holes that don’t need pointing back to a state of apology afterwards. On engineering bricks, which can absolutely humble a lesser core, this bit stays in control. The balanced, precision-engineered barrel reduces vibration, which matters both for the finish and for how your wrists feel at the end of a long day on site.
Spectrum’s BZX Zenith and Dry Coring
Worth being clear: this is a dry core drill. No water feed required, no adaptor faff. That makes it genuinely fast to set up and move between holes. On dustier substrates like aerated blocks or softer brick, keep the speed up and let the bit do the work rather than leaning in hard. On dense concrete, a steady consistent pressure gives the segments time to bite properly rather than skating across the surface. Either way, the OX Spectrum BZX Zenith diamond core is hard to beat for the combination of cut speed, segment life and size availability in a single product.
Pro Tip: On hard or dense concrete, keep pressure firm and consistent rather than pushing hard in bursts — letting the diamond segments work at a steady rate keeps them cutting cleanly and extends segment life significantly.
The BZX Zenith is used daily by electricians, plumbers, heating engineers and general builders for coring through walls and floors on both new build and refurbishment work. It handles standard brick, engineering brick, concrete blocks, aerated blocks, dense concrete and natural stone without needing to swap bits between materials. From a 22mm pilot hole for a conduit up to a 182mm opening for a soil pipe or flue, the size range covers most common trade coring tasks in a single product family.
Alternating depth side slots for aggressive cutting
Friction-reduced geometry
Dry use only
Not suitable for: Not suitable for wet coring setups or applications requiring a water-cooled system. Not recommended for ceramic tiles or glass, where a specialist wet diamond core should be used instead.
Fit the BZX Zenith to a suitable core drill machine using a 1/2in BSP adaptor. Mark your centre point clearly and, if working on a smooth or hard surface, consider a small pilot dimple to stop the core wandering on start-up. Begin drilling at a moderate speed to let the segments engage, then settle into a firm, consistent feed pressure for the rest of the hole.
On engineering brick or dense concrete, resist the urge to push harder when progress slows. Maintain steady pressure and let the diamond do the work. If the core starts to feel like it's riding rather than cutting, back it out, clear the slot debris, and re-engage. Overheating a dry core on very hard material is the quickest way to shorten segment life, so short bursts with brief pauses are better than prolonged continuous cutting on the toughest substrates.
Select the correct size BZX Zenith core for the required hole diameter
Fit a 1/2in BSP female thread adaptor to your core drill machine and secure the core firmly
Mark the centre point of the hole on the surface clearly
Start the drill at moderate speed and position the core guide on the marked centre
Begin with light pressure until the core has seated and the cut is established
Increase to a firm, consistent feed pressure and maintain this throughout the cut
On hard materials, back the core out briefly every 30 to 40 seconds to clear debris from the slots
Complete the cut, withdraw the core cleanly and remove the slug from the barrel before the next hole
Can the BZX Zenith be used with a standard SDS drill or does it need a dedicated core drill machine?
For larger sizes — anything above around 52mm — a dedicated core drill machine is strongly recommended. The torque and stability of a core drill makes a real difference to cut quality and segment life. Smaller sizes like 22mm to 48mm can be used with a powerful SDS Plus or SDS Max drill fitted with the correct 1/2in BSP adaptor, but a core drill will always give cleaner, faster results.
Is the BZX Zenith a wet or dry core drill?
The BZX Zenith is a dry core drill. No water feed is required or recommended. This makes it straightforward to use on site without water supply concerns, though on very hard or dense concrete you should use short cutting bursts rather than continuous drilling to manage heat at the segment.
The BZX Zenith uses laser-welded diamond segments with a 10mm height, bonded to a precision-engineered steel barrel. The alternating depth side slot configuration increases the aggressiveness of the cut and aids swarf clearance during dry operation. Friction-reduced geometry across the barrel and segment profile lowers resistance during penetration. The 1/2in BSP female thread is the standard connection across the Spectrum core range and is compatible with widely available adaptors.
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