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Power Tool Accessories

Cut clean holes for back boxes, downlights and cable runs without wandering. This Knightsbridge range pairs HSS pilot drill bits and hex-shank arbors with bi-metal holesaws from 25mm up to 90mm, many with 4/6 TPI variable teeth for a faster, steadier cut. The arbor centres the saw on the pilot bit, so first contact stays put and the bore comes out where you marked it.

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Clean holes, every time

Cutting a neat hole for a back box, a downlight or a cable run is half the job on an electrical install. This range pairs holesaws with the pilot bits and arbors that hold them on line, so the cut starts where you marked it and the bore comes out round rather than ragged.

Bi-metal holesaws

The holesaws here run from 25mm up to 90mm, covering the common sizes for sockets, fittings and conduit. Bi-metal construction gives a hard cutting edge on a more flexible body, and many carry 4/6 TPI variable teeth, which clear waste quickly and keep the saw cutting steadily through board and thin metal.

Arbors and pilot bits

An arbor is the shaft that mounts the holesaw onto your drill, with an HSS pilot drill bit poking through the centre. The pilot bites first and centres the saw, so first contact stays put instead of wandering across the surface. Different arbor sizes match different holesaw ranges, so it is worth checking the fit.

Hex shanks

The arbors use a hex shank, which seats firmly in a drill or driver chuck and resists slipping under load. That steady grip matters when a larger holesaw needs a bit of torque to get through, keeping the cut controlled rather than snatching.

Cutting clean and slow

A holesaw rewards a steady hand more than brute speed. Letting the pilot bit settle first, then easing the saw in at a moderate pace, keeps the teeth clearing waste rather than clogging and burning. Backing off now and then lets the swarf drop clear, which matters on deeper cuts and helps the edge last. Rushing tends to overheat the blade and leave a rougher bore, so patience here pays off in both the finish and the life of the saw.

Building a set

Pick the holesaw sizes you reach for most, then add the matching arbor and a few spare pilot bits, since the bit takes the first wear on every hole. It is worth holding a small spread of diameters so you are ready for whatever fitting turns up rather than stopping mid-job to source one. With the right combination to hand, the next run of holes goes in quickly and lands where you planned. Free UK delivery over £99, worldwide shipping.

Frequently Asked Questions

What is an arbor for?
The arbor is the shaft that mounts a holesaw onto your drill. It also holds the pilot drill bit in its centre, which bites first and keeps the saw from wandering when it starts to cut.

Why do the teeth say 4/6 TPI variable?
Variable teeth mix coarser and finer spacing along the blade, listed here as 4/6 teeth per inch. The mix clears waste quickly and helps the saw cut steadily through both board and thinner metal.

What size holesaw do I need?
It depends on the fitting. The range covers 25mm up to 90mm, so check the diameter your back box, downlight or fitting calls for and match the holesaw to it.

Do the pilot bits wear out?
The pilot bit takes the first contact on every hole, so it does the early wearing. Keeping a few spare HSS pilot bits means you can swap one in rather than stopping a job.

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