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38mm Bi-Metal Holesaw - 4/6 TPI Variable Teeth

£499
The RRP is the manufacturer's recommended retail price of the item.
Limited Stock
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Description

The Knightsbridge 38mm bi-metal holesaw is a cylindrical drill bit attachment designed to cut circular holes through steel, stainless steel, die-cast metals, hardwood flooring, plywood and plastics. The cutting edge carries variable 4/6 TPI (teeth per inch) bi-metal teeth that combine high-speed steel cutting edges with a flexible spring steel body, allowing the saw to flex under lateral load without snapping.

Designed for electricians fitting 38mm back boxes, downlight installers cutting ceiling apertures, and general trade applications requiring a 38mm circular cut-out, the holesaw delivers a 38mm diameter hole with a maximum cutting depth of 38mm through the material. The saw requires a separate arbor (Knightsbridge HSARBORL) to mount it to a power drill. The variable tooth pitch reduces vibration and improves chip clearance when cutting through layered materials like plywood or metal-faced composite panels.

The bi-metal construction allows the holesaw to retain its cutting edge through repeated use in abrasive materials where carbon steel would dull quickly. The yellow finish provides visibility when the saw is set down on-site and helps distinguish Knightsbridge accessories from other brands in a shared toolkit. The 38mm diameter is a standard size for UK electrical back boxes, making this a commonly-stocked size for domestic and commercial electrical installation work.

Specification
Diameter 38 mm
Recessed Depth 38 mm
Cut-out Diameter 38 mm
Construction Steel
Finish Yellow
Warranty 0
Downloads

Product Specification Sheet

Frequently Asked

What arbor does this holesaw require?

The 38mm bi-metal holesaw requires a separate arbor to mount it to a power drill. Knightsbridge produces the HSARBORL arbor specifically for this range. The arbor is not included with the holesaw and must be purchased separately.

What materials can it cut through?

The bi-metal construction allows this holesaw to cut steel, stainless steel, die-cast metals, hardwood floors, plywood and plastics. The 4/6 TPI variable tooth pitch handles both harder metals and softer wood-based materials without clogging.

What is the maximum cutting depth?

The cutting depth is 38mm, meaning the holesaw can cut through material up to 38mm thick in a single pass. For thicker materials, the hole would need to be started from both sides or the material repositioned.

Is this the correct size for UK back boxes?

Yes. 38mm is a standard cut-out diameter for electrical back boxes in UK residential and light commercial installations, making this one of the most commonly-used holesaw sizes for electrical work.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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    Description

    The Knightsbridge 38mm bi-metal holesaw is a cylindrical drill bit attachment designed to cut circular holes through steel, stainless steel, die-cast metals, hardwood flooring, plywood and plastics. The cutting edge carries variable 4/6 TPI (teeth per inch) bi-metal teeth that combine high-speed steel cutting edges with a flexible spring steel body, allowing the saw to flex under lateral load without snapping.

    Designed for electricians fitting 38mm back boxes, downlight installers cutting ceiling apertures, and general trade applications requiring a 38mm circular cut-out, the holesaw delivers a 38mm diameter hole with a maximum cutting depth of 38mm through the material. The saw requires a separate arbor (Knightsbridge HSARBORL) to mount it to a power drill. The variable tooth pitch reduces vibration and improves chip clearance when cutting through layered materials like plywood or metal-faced composite panels.

    The bi-metal construction allows the holesaw to retain its cutting edge through repeated use in abrasive materials where carbon steel would dull quickly. The yellow finish provides visibility when the saw is set down on-site and helps distinguish Knightsbridge accessories from other brands in a shared toolkit. The 38mm diameter is a standard size for UK electrical back boxes, making this a commonly-stocked size for domestic and commercial electrical installation work.

    Specification
    Diameter 38 mm
    Recessed Depth 38 mm
    Cut-out Diameter 38 mm
    Construction Steel
    Finish Yellow
    Warranty 0
    Downloads

    Product Specification Sheet

    Frequently Asked

    What arbor does this holesaw require?

    The 38mm bi-metal holesaw requires a separate arbor to mount it to a power drill. Knightsbridge produces the HSARBORL arbor specifically for this range. The arbor is not included with the holesaw and must be purchased separately.

    What materials can it cut through?

    The bi-metal construction allows this holesaw to cut steel, stainless steel, die-cast metals, hardwood floors, plywood and plastics. The 4/6 TPI variable tooth pitch handles both harder metals and softer wood-based materials without clogging.

    What is the maximum cutting depth?

    The cutting depth is 38mm, meaning the holesaw can cut through material up to 38mm thick in a single pass. For thicker materials, the hole would need to be started from both sides or the material repositioned.

    Is this the correct size for UK back boxes?

    Yes. 38mm is a standard cut-out diameter for electrical back boxes in UK residential and light commercial installations, making this one of the most commonly-used holesaw sizes for electrical work.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.