An 11-piece cobalt holesaw kit covering the sizes you actually reach for on site. Includes 16, 20, 25, 32, 44, 51, 64, 68 and 76mm saws, plus arbors and a pilot drill. Built for metal, wood and more.
The Dart 11 piece cobalt holesaw kit is one of those sets you buy once and stop thinking about. Cobalt-grade steel teeth handle the jobs that would chew through standard bi-metal saws in short order — stainless steel, hardened plate, cast iron flanges, the stuff that turns a normal holesaw red and useless inside a few cuts. With nine saw sizes ranging from 16mm up to 76mm, you’ve got the spread to handle back boxes, conduit entry points, pipe penetrations and structural fixings without reaching for a second kit.
The included sizes are 16, 20, 25, 32, 44, 51, 64, 68 and 76mm — a practical selection rather than a marketing exercise. That 32mm is your standard cable gland size, 68mm is your single-gang back box, and 76mm covers most plastic pipe and larger conduit entry work. Not every manufacturer gets this right, but this spread covers the calls you get day in, day out.
What the Cobalt Dart Holesaw Kit Is Actually For
Cobalt holesaws earn their place on jobs where bi-metal just won’t cut it — literally. The cobalt content increases heat resistance significantly, so the teeth stay sharp longer when cutting harder materials. That matters when you’re drilling multiple holes in a steel enclosure or working through a hardened door skin. It also means the saw is entirely at home in timber, MDF, plasterboard and plastic, so you’re not carrying two sets.
The Kit Contents
Alongside the nine holesaw cups, the Dart 11 piece cobalt holesaw kit includes two arbors and a pilot drill bit. Everything stores in a moulded carry case, which won’t fall apart when it hits the van floor — a low bar, but you’d be surprised how many cases don’t clear it. The arbors are the standard quick-release type, so swapping between saw sizes is fast when you’re working through a board full of different-sized penetrations.
Whether you’re an electrician, plumber, joiner or general builder, a cobalt holesaw set at this price point makes sense as a permanent fixture in the van rather than a one-job purchase.
Pro Tip: When cutting stainless steel or hardened plate, use a slow drill speed and apply a drop of cutting oil to the teeth before starting — this keeps heat down and can double the life of even a cobalt saw.
Cobalt holesaws are the go-to for electricians and plumbers working through steel enclosures, consumer units, metal trunking lids and stainless steel sinks. The range of sizes in this kit makes it equally useful for joinery work, cabinet installations, door furniture fitting and general building work where a range of clean holes is needed through timber, sheet material or light metal.
The larger sizes, particularly the 64mm, 68mm and 76mm saws, are standard sizes for back box installations, soil pipe penetrations and drainage routing through structural timber. The smaller sizes from 16mm to 32mm cover cable entries, grommets, conduit fittings and lock cylinders.
Best For
Steel enclosures and panels
Back box and electrical installations
Conduit and cable entry points
Pipe penetrations through timber and masonry boards
Stainless steel and hardened materials
General joinery and cabinet work
Included Sizes
16mm
20mm
25mm
32mm
44mm
51mm
64mm
68mm
76mm
Key Features
Cobalt-grade steel for extended tooth life
Quick-release arbors included
Pilot drill bit included
Moulded carry case
Suitable for metal, timber, MDF and plastic
11-piece kit
Not suitable for: Not recommended for continuous heavy-duty use in hardened tool steel or reinforced concrete. Cobalt holesaws are not a replacement for core drills in masonry or brick.
Fit the appropriate arbor to your drill and lock the pilot bit in place. Select the correct holesaw cup for your required diameter and thread it securely onto the arbor. Mark your centre point, punch a small indent to locate the pilot drill, then start at a slow speed before increasing once the teeth have bitten in.
For metal cutting, keep the speed low and steady throughout. Applying a drop of cutting fluid helps with heat management and keeps the teeth sharp for longer. When the saw breaks through, ease the pressure off to avoid snatching. To clear waste from inside the cup, most designs have slots in the body for a screwdriver or nail.
Select the correct holesaw cup for your required hole diameter
Thread the holesaw cup securely onto the arbor
Insert the pilot drill bit through the arbor and tighten the chuck
Mark and centre-punch your drill point on the workpiece
For metal, apply a small amount of cutting oil to the teeth before starting
Begin drilling at low speed until the teeth have established a groove
Increase to working speed while maintaining steady, consistent pressure
Ease off pressure as the pilot breaks through to avoid snatching
Clear swarf and waste from inside the cup using the body slots before the next cut
What materials can the cobalt holesaws in this kit cut through?
Cobalt holesaws are suitable for stainless steel, mild steel, hardened panels, cast iron, timber, MDF, plywood, plasterboard and most plastics. The cobalt content makes them significantly more heat-resistant than standard bi-metal saws, which is the difference-maker on harder metals.
Which arbor size do these holesaws use, and are they compatible with other brands?
The kit includes arbors sized to suit the holesaw cups supplied. The thread pattern used by Dart is a standard format, so in most cases these will be compatible with other major holesaw brands, though it is worth checking before mixing and matching on site.
Is this kit suitable for electricians fitting back boxes?
Yes, the 68mm saw is the standard single-gang back box size and is included in this kit. The 51mm covers many double-socket and media plate installations, and the range of smaller sizes handles cable entry glands, grommets and conduit fittings throughout. It is a genuinely useful spread for electrical first-fix work.
The holesaw cups in this kit are manufactured from cobalt-enriched high-speed steel, which provides greater thermal resistance than standard bi-metal construction. This means the teeth retain their edge at higher temperatures, making them suitable for harder ferrous metals where heat build-up would otherwise cause premature dulling. The set is compatible with standard quick-release arbors and is supplied with two arbors and a pilot drill as part of the 11-piece kit.
Brand
Dart
SKU
DPHK11
Kit Pieces
11
Holesaw Sizes Included
16, 20, 25, 32, 44, 51, 64, 68, 76mm
Material
Cobalt high-speed steel
Includes
2 arbors, 1 pilot drill, 9 holesaw cups, carry case
Case
Moulded carry case
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