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Drill Bits & Holesaws

Drill bits and holesaws from Knightsbridge for cutting clean holes when fitting accessories and routing cable. The range pairs HSS pilot drill bits, sold singly and in five-packs, with A2 and A4 hex-shank arbors that chuck into a standard drill. Bi-metal holesaws run from 25mm up to 90mm, most with 4/6 TPI variable teeth, covering everything from small grommet holes to wider downlight cut-outs.

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Drill Bits and Holesaws for Clean Cutting

Cutting clean, accurate holes is half the work when fitting accessories and routing cable, and this range gathers the bits and saws that get it right. HSS pilot drill bits keep a holesaw centred as it starts the cut, stopping it from wandering across the surface, and they are sold both singly and in packs of five so you can keep spares to hand for when one dulls or breaks mid-job. The pilot bit does the initial guiding work while the saw follows the line you have marked.

Hex-shank arbors in A2 and A4 sizes carry the holesaw and chuck straight into a standard drill, with a hex shank that grips firmly and resists slipping under load. Pairing the right arbor with your saw means the assembly runs true and the cut stays round. The bi-metal holesaws themselves run from 25mm up to 90mm, covering a wide spread of hole sizes from small grommet and cable holes through to wider cut-outs for fittings such as downlights. Many use 4/6 TPI variable teeth, a tooth pattern that handles a range of materials and helps clear waste as it cuts.

With this set you can size the hole to the task: a small bit for a single cable, a mid-range saw for a standard fitting, or one of the larger holesaws for a wider opening. Choose the holesaw diameter to match what you are mounting, fit it to the matching arbor with a pilot bit, and you are ready to cut. Free UK delivery over £99, with worldwide shipping available.

Frequently Asked Questions

What is the pilot drill bit for?
The HSS pilot drill bit sits at the centre of the holesaw and starts the hole, keeping the saw on the spot you have marked rather than letting it skate across the surface. It guides the cut so the holesaw follows cleanly and stays round.

What does the arbor do?
The arbor is the part that holds the holesaw and fits into your drill. The A2 and A4 hex-shank arbors here chuck into a standard drill and grip firmly under load, so the saw runs true while it cuts. You match the arbor to the holesaw you are using.

What sizes of holesaw are available?
The bi-metal holesaws run from 25mm up to 90mm. Smaller sizes suit grommet and cable holes, while the larger diameters handle wider cut-outs such as those for downlights. You pick the diameter to match whatever you are mounting.

What does 4/6 TPI variable teeth mean?
TPI stands for teeth per inch, and a variable 4/6 pattern mixes tooth spacing along the blade. This helps the holesaw cut through a range of materials and clears waste as it goes, giving a smoother cut than a single fixed tooth count.

Are the pilot bits sold on their own?
The HSS pilot drill bits are available both singly and in packs of five, so you can buy a single replacement or keep a few spares for a longer run of work. Pilot bits take wear over time, so having extras to hand is useful.

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