An 11-piece cobalt holesaw kit put together with electricians in mind. Includes six holesaws from 16mm to 64mm, two arbors, an arbor adaptor, and two HSS pilot drill bits. Everything you need in one box.
This Abracs electricians holesaw set covers the sizes you actually reach for day to day on a wiring install. Six cobalt holesaws ranging from 16mm up to 64mm, two arbors, an arbor adaptor, and a pair of HSS pilot drill bits — all bundled into a single kit that makes sense for an electrician rather than a general DIYer.
Cobalt-grade steel is the right choice here. It holds its edge longer than standard HSS when you’re cutting through back boxes, trunking, metal consumer unit enclosures, or the occasional stainless steel flush plate. If you’re working on a big commercial first-fix where you’re spinning holesaws all day, that extra heat resistance matters. Standard HSS will do the job, but it won’t do it as many times before it starts dragging.
What’s in the Abracs Electricians Holesaw Kit
The size selection is well thought through. The 16mm and 20mm are your go-to sizes for cable entry points and conduit, 22mm handles standard plastic knockouts, 25mm suits compression fittings and larger conduit entries, 32mm covers the common back box knockout size, and the 64mm is there for surface pattress boxes and partition wall penetrations. The two arbors cover different shank configurations, and the adaptor means you’re not left hunting through your van for a fitting that works with a particular drill.
Pilot Drill Bits and Arbor Set-Up
Both HSS pilot drill bits are included so you have a spare when one inevitably snaps mid-job — because it will, eventually. The pilot keeps the holesaw centred and prevents that annoying walk on smooth metal or plastic surfaces, so it’s not just a throwaway extra.
Compact enough to sit in a tool bag without taking over an entire pocket, this electricians holesaw set is a sensible buy whether you’re kitting out a new apprentice or topping up your own kit.
Pro Tip: When cutting through metal back boxes, run the holesaw at a lower speed than you would for timber or plasterboard — cobalt handles heat well, but keeping the RPM down and applying light, consistent pressure gives a cleaner cut and extends the life of the teeth considerably.
Used primarily by electricians for cutting cable entry holes, back box knockouts, and conduit penetrations through plasterboard, timber stud work, sheet metal, and plastic enclosures. The size range makes it equally useful for first-fix wiring on new builds and second-fix work on refurbishments. The 64mm saw is large enough for surface pattress boxes and consumer unit knockouts, which makes this kit practical on domestic and light commercial sites alike.
Best For
Cable entry holes and conduit penetrations
Back box knockouts in plasterboard and timber
Consumer unit and enclosure cut-outs
Metal sheet and plastic panel cutting
First-fix and second-fix electrical installation
Works With
Standard power drills and SDS adaptors via included arbors
Corded and cordless drills
Both arbor sizes covered by included adaptor
Plasterboard, timber, sheet metal, plastic
Key Specifications
11-piece kit
Holesaw sizes: 16mm, 20mm, 22mm, 25mm, 32mm, 64mm
Cobalt-grade steel construction
2x arbors (A1 and A2)
1x arbor adaptor
2x HSS pilot drill bits
Not suitable for: Not ideal for cutting masonry, concrete, or ceramic tiles — you need a core drill or diamond holesaw for those. The 64mm is the largest size in the kit, so larger penetrations for bigger conduit or trunking runs will need a separate saw.
Fit the appropriate arbor to your drill, attach the holesaw, and seat the pilot drill bit so it protrudes beyond the holesaw teeth. Mark your centre point, start the pilot drill first to lock the saw in position, then apply steady forward pressure as the holesaw bites. For metal surfaces, keep your speed lower and let the cobalt teeth do the work without forcing it.
When the cut is nearly through, ease off the pressure to avoid snatching, particularly on thin sheet metal or plastic. If the slug sticks in the saw after cutting, use the arbor slot to pop it free rather than digging at it with a screwdriver — saves the teeth.
Select the correct holesaw size for the job and attach it to the appropriate arbor
Insert the HSS pilot drill bit through the arbor so it protrudes past the holesaw teeth
Mark the centre of your cut clearly on the work surface
Set your drill to a suitable speed — lower for metal, faster for timber or plasterboard
Position the pilot bit on your centre mark and begin drilling to locate the saw before the teeth engage
Apply steady, consistent pressure as the holesaw cuts through — avoid forcing it
Ease pressure as the saw breaks through to prevent snatching or damage to the material
Remove the slug from the holesaw using the arbor ejector slot
What size holesaws are included in this kit?
The kit contains six holesaws: 16mm, 20mm, 22mm, 25mm, 32mm, and 64mm. These cover the most common sizes needed for electrical installation work, from cable entry points up to surface pattress box cut-outs.
Why cobalt rather than standard HSS for electrical work?
Cobalt steel handles heat better than standard HSS, which matters when you're cutting through metal back boxes, consumer unit enclosures, or stainless steel. On a busy site where you're making a lot of cuts in quick succession, cobalt holds its edge longer and performs more consistently.
Will the arbors in this kit fit my existing drill?
The kit includes two arbors covering different shank configurations plus an adaptor, so compatibility with most standard power drills is covered. If you're using an SDS drill, you may need a separate SDS chuck adaptor, but for standard keyed or keyless chucks the kit should have you sorted.
Holesaws are manufactured from cobalt-grade high speed steel, which gives improved heat resistance and edge retention over standard M2 HSS, particularly when cutting ferrous metals at sustained speeds. The pilot drill bits are HSS construction, suitable for locating cuts accurately on metal, timber, and plastic surfaces. Two arbor sizes are included alongside an adaptor to provide broad drill compatibility across the kit.
Brand
Abracs
SKU
ABHSCKIT11
Kit Contents
11 pieces
Holesaw Sizes
16mm, 20mm, 22mm, 25mm, 32mm, 64mm
Holesaw Material
Cobalt HSS
Arbors Included
2 (A1 and A2)
Arbor Adaptor
1x included
Pilot Drill Bits
2x HSS
Intended Use
Electrical installation
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