{"product_id":"38mm-bi-metal-holesaw-4-6-tpi-variable-teeth","title":"38mm Bi-Metal Holesaw - 4\/6 TPI Variable Teeth","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eDesigned 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.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e38 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecessed Depth\u003c\/td\u003e\n\u003ctd\u003e38 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut-out Diameter\u003c\/td\u003e\n\u003ctd\u003e38 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eYellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_1541328_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat arbor does this holesaw require?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat materials can it cut through?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum cutting depth?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this the correct size for UK back boxes?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. 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.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293885784331,"sku":"HS38MM","price":4.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/1428948_616bd332-e873-42a6-a0b9-c6c8eba5edc1.jpg?v=1714665536","url":"https:\/\/niori.co.uk\/products\/38mm-bi-metal-holesaw-4-6-tpi-variable-teeth","provider":"Niori","version":"1.0","type":"link"}