An 8-piece cobalt holesaw kit from Dart, including sizes 16, 20, 25, 32, 44 and 51mm. Built for cutting through harder materials where standard bi-metal saws struggle. Comes with arbors and pilot drill for a complete setup.
The Dart 8 piece cobalt holesaw kit is the kind of set that earns its place in the van rather than gathering dust in a drawer. Cobalt-grade steel runs hotter and harder than standard bi-metal, which makes a real difference when you’re pushing through stainless steel, cast iron, or anything that would chew through a cheaper saw in a handful of holes. Six saw sizes cover a solid range of everyday jobs: 16, 20, 25, 32, 44 and 51mm.
Dart have been producing quality cutting accessories for years and this kit reflects that. The cobalt content in the tooth steel resists heat build-up better than ordinary HSS, meaning the cutting edge stays sharper for longer under sustained use. That matters when you’re doing multiple holes in a run rather than the odd one-off. Anyone who has burned out a cheap holesaw halfway through a stainless kitchen worktop will understand the appeal immediately.
What the Dart Cobalt Holesaw Kit Covers
The size range here covers a lot of ground for electrical, plumbing, and general installation work. The 16mm and 20mm saws are useful for conduit and smaller cable entry points. The 25mm and 32mm sizes suit pipework and mid-range cable management, while the 44mm and 51mm saws open up ducting, larger waste pipe penetrations, and spotlighting cutouts. Having all of these in one kit means fewer trips to the merchant when a job shifts slightly from what was planned.
What Comes in the Kit
Alongside the six holesaws, the kit includes arbors and a pilot drill so you can get straight to work without hunting around for the right mandrel. Everything is stored in a case, keeping the saws protected and the pilot bits from going walkabout at the back of a toolbox. Eight pieces total, properly organised.
For trade use on mixed materials and varied installation work, the Dart 8 piece cobalt holesaw kit offers a level of performance and completeness that justifies the step up from entry-level sets. If you’re cutting more than the occasional hole, cobalt is worth it.
Pro Tip: When cutting stainless steel or harder metals, run the holesaw at a lower RPM than you would for timber or plastic, apply light cutting fluid to the teeth, and let the saw do the work rather than forcing it through.
This kit is used across electrical installation, plumbing, and general building work wherever holes need to be cut through harder or mixed materials. The smaller sizes suit cable entry points, back boxes, and conduit runs, while the larger saws handle soil pipe penetrations, ducting cutouts, and downlight apertures in both timber and metal substrates. It works in sheet steel, stainless, copper, aluminium, hardwood, and plastic board, making it genuinely useful for sparkies, plumbers, and general builders alike.
Best For
Stainless steel and harder metals
Cable and conduit entry points
Plumbing pipe penetrations
Downlight and spotlighting cutouts
Ducting and ventilation openings
Hardwood and dense timber
Works With
Standard SDS and drill arbors
Corded and cordless drill drivers
Pillar drills
Steel, aluminium, copper
Hardwood and MDF
Plastic and uPVC board
Key Specifications
Sizes: 16, 20, 25, 32, 44, 51mm
8 pieces total including arbors and pilot drill
Cobalt-grade tooth steel
Stored in protective carry case
Compatible with standard arbor fitment
Not suitable for: Not ideal for very thin sheet metal under 1mm where a step drill would give a cleaner result. These saws are designed for power drills and pillar drills, not for use with hand tools.
Fit the appropriate arbor and pilot drill before selecting your holesaw size. Mark the centre point clearly, as the pilot drill keeps the saw tracking true once it bites. Apply light pressure to start, let the teeth engage fully before increasing feed rate. On harder metals, reduce drill speed and use a small amount of cutting fluid on the teeth to manage heat and protect the cutting edge.
For deep cuts through thick timber or double layers of material, clear the plug from the saw regularly to avoid the gullets packing out and slowing the cut. Keep the drill perpendicular throughout to avoid oval holes or premature tooth wear on one side of the saw.
Select the correct holesaw size for the job and secure it firmly onto the arbor
Fit the pilot drill through the arbor centre and tighten
Mark the centre point of the hole on the workpiece clearly
Set drill speed according to material: slower for steel, faster for timber and plastic
Apply light cutting fluid to the teeth before cutting into metal
Start the cut with steady moderate pressure, allowing the pilot drill to engage first
Maintain consistent pressure and keep the drill perpendicular to the surface
Clear the plug from the saw between cuts to prevent gullet packing on deep material
After use, remove the plug, clean the teeth, and store the saw in the provided case
What sizes are included in the Dart 8 piece cobalt holesaw kit?
The kit includes six holesaw sizes: 16, 20, 25, 32, 44 and 51mm, along with arbors and a pilot drill, giving you eight pieces in total.
Can these holesaws cut through stainless steel?
Yes. The cobalt-grade tooth steel is specifically better suited to harder materials like stainless steel compared to standard bi-metal saws. Use a lower drill speed and apply cutting fluid to get the best life from the teeth.
Will the arbors in this kit fit a standard cordless drill?
Yes, the arbors use a standard fitment compatible with most corded and cordless drills with a keyless or keyed chuck. Check the arbor shank diameter against your drill chuck capacity before use if you are using a smaller drill.
The holesaws in this kit are manufactured from cobalt-alloyed high-speed steel, which offers improved heat resistance and edge retention over standard HSS or bi-metal constructions. Cobalt content in the tooth steel allows the cutting edge to maintain hardness at elevated temperatures, which is particularly relevant when cutting ferrous metals and stainless steel. The kit includes correctly matched arbors and a pilot drill for immediate use.
Brand
Dart
SKU
DPHK8
Kit Contents
8 pieces
Holesaw Sizes
16mm, 20mm, 25mm, 32mm, 44mm, 51mm
Tooth Material
Cobalt-grade high-speed steel
Includes
Arbors, pilot drill, carry case
Application
Metal, hardwood, plastic, timber
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