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An 11-piece diamond core set built for plumbers, electricians and general building contractors. Includes five core sizes from 38mm to 127mm, SDS plus and hex shank adaptors, a pilot drill and drift key. Good value, ready to work straight out of the box.
The Dart Red10 PRO Spiro Diamond Core Set is a proper working kit that covers the core sizes you actually reach for on site. Five Spiro diamond core drills — 38mm, 52mm, 65mm, 117mm and 127mm — along with two SDS plus adaptors, two hexagon shank adaptors, a pilot drill and a drift key. Eleven pieces, one case, no missing bits. The dart red10 spiro diamond core set is aimed squarely at tradespeople who need a reliable kit ready to go rather than building one up piecemeal over time.
Dart’s Red10 PRO cores use a Spiro segment design, which is essentially a spiral-cut arrangement that helps keep the cut cooler and clears slurry more effectively than a straight-segmented core. That matters on longer drilling runs through dense blockwork or engineering brick, where heat build-up is the main reason cores wear out early. The five sizes in this set cover most of the common trade requirements — pipe penetrations through walls, back boxes, conduit runs, soil pipe openings. If you are a plumber pushing 110mm overflow or a spark pulling cable through a cavity wall, there is a drill here for the job.
Where the Dart Red10 PRO Spiro Core Set Earns Its Keep
The dual adaptor system is one of the more practical features in this set. One short and one long version of both the SDS plus and the hex shank adaptors means you can switch between rotary hammer drills and standard drills without hunting around for the right fitting. The pilot drill keeps the core located accurately on the surface before the segments bite, which makes a real difference when you are drilling into a rendered or tiled wall and do not want the core skating around before it grips.
The drift key is a small thing but worth mentioning — it is the tool you use to knock the core out of the barrel after a deep cut, and it is the accessory that always goes missing on a busy site. Having one supplied in the set is the kind of detail that saves ten minutes of rooting through a van.
Pro Tip: When using the larger cores like 117mm or 127mm through dense blockwork, keep the drill speed moderate and let the segments do the work rather than forcing pressure — overloading a diamond core is the fastest way to blunt it prematurely.
This set is used wherever you need clean, accurate holes through masonry, brick, blockwork and concrete. Plumbers use the mid-range sizes for soil pipe and waste penetrations through internal and external walls. Electricians reach for the smaller sizes when core drilling through brickwork for back boxes or conduit entry points. General builders use the full range for anything from flue liners to drainage runs. It covers domestic and light commercial work comfortably.
Best For
Pipe penetrations through masonry walls
Electrical conduit and back box openings
Soil pipe and waste runs
Flue and ventilation openings
General building trade core drilling
Compatible With
SDS Plus rotary hammer drills (short and long adaptor included)
Hex shank drills (short and long adaptor included)
Brick, blockwork, concrete and dense masonry
Key Specifications
Core sizes: 38mm, 52mm, 65mm, 117mm, 127mm
Segment type: Spiro diamond
Adaptors: SDS Plus x2 (short and long), Hex shank x2 (short and long)
Pilot drill included
Drift key included
Total pieces: 11
Not suitable for: Not suitable for wet drilling systems or for use on reinforced concrete where rebar is likely to be encountered. The Spiro cores in this set are dry-cut diamond cores intended for standard masonry and brick rather than hard aggregate concrete or granite.
Fit the appropriate adaptor for your drill — SDS plus for a rotary hammer, hex shank for a standard corded or cordless drill. Attach the pilot drill to keep the core positioned accurately when starting the hole. Set your drill to rotary mode only, not hammer, when using diamond cores.
Apply steady, moderate pressure and let the diamond segments do the cutting. Do not force the drill. On deeper cuts or dense material, withdraw the core periodically to clear slurry and allow the segments to cool. When the cut is complete, use the supplied drift key to knock the core slug cleanly out of the barrel before your next hole.
Select the correct core size for the job and fit it to the appropriate adaptor
Attach the pilot drill to the centre of the core barrel
Fix the adaptor securely into your SDS plus or hex shank drill chuck
Mark the centre point of the hole on the surface
Set the drill to rotary mode only — never hammer action with diamond cores
Start the drill at moderate speed and allow the pilot to locate before the segments engage
Apply consistent, even pressure without forcing the tool into the material
Withdraw the core periodically on deep cuts to clear slurry and reduce heat build-up
Once through, use the drift key to remove the core plug from the barrel
Can I use these cores with a standard cordless drill or do I need an SDS machine?
Both options are covered. The set includes hex shank adaptors for use with standard corded or cordless drills, and SDS plus adaptors for rotary hammer drills. For the larger core sizes like 117mm and 127mm, a rotary hammer drill will deliver better results as it provides more torque — a standard drill will struggle in dense blockwork.
Are these wet or dry diamond cores?
These are dry-cut diamond cores. No water feed is required during normal use. On longer cuts through dense material, withdrawing the core periodically to let it cool is good practice, but there is no need for any wet drilling setup.
What is the Spiro segment design and why does it matter?
Spiro refers to the spiral-cut arrangement of the diamond segments on the core barrel. This design helps pull slurry out of the cut more efficiently and keeps the cutting temperature lower compared to a straight-segment core. In practical terms it means the core lasts longer and cuts more cleanly, particularly through dense brick or engineering blockwork.
The Dart Red10 PRO cores feature a Spiro diamond segment configuration designed for dry cutting through standard masonry materials including brick, block and concrete. The Red10 PRO designation indicates Dart's professional-grade segment specification, offering improved segment life and cut quality over entry-level equivalents. The kit is supplied with a full adaptor set covering both SDS plus and hex shank drill interfaces, making it compatible with the majority of site drills in common use.
Brand
Dart
Model
Red10 PRO Spiro
Set Contents
11 pieces
Core Sizes
38mm, 52mm, 65mm, 117mm, 127mm
Segment Type
Spiro diamond
Adaptors Included
SDS Plus short, SDS Plus long, Hex shank short, Hex shank long
Accessories
Pilot drill, drift key
Drilling Method
Dry cut
SKU
SPIRO-SET
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