{"product_id":"70mm-bi-metal-holesaw-variable-tooth","title":"70mm Bi-Metal Holesaw - Variable Tooth","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Knightsbridge 70mm bi-metal holesaw is a cylindrical cutting tool designed to cut circular apertures in metal, wood and plastic materials. The cutting edge carries bi-metal variable teeth at 4\/6 TPI (teeth per inch), combining wear resistance for metal cutting with aggressive material removal for wood and composite materials. The 70mm diameter refers to the outer cutting edge, producing a 70mm diameter hole in the workpiece.\u003c\/p\u003e\n\u003cp\u003eDesigned for electricians, shopfitters and tradespeople installing electrical accessories, the holesaw cuts through steel plate, stainless steel sheet, die-cast metal junction boxes, hardwood flooring, plywood, and rigid plastics up to 38mm thick in a single pass. The bi-metal construction bonds a high-speed steel cutting edge to a flexible steel body, allowing the teeth to stay sharp through metal and wood cutting cycles without fracturing. The holesaw requires a separate arbor (Knightsbridge HSARBORL) to mount onto a drill chuck.\u003c\/p\u003e\n\u003cp\u003eThe variable tooth spacing at 4 and 6 TPI reduces vibration and provides smoother cutting through mixed materials compared to fixed-tooth holesaws. The 38mm cutting depth accommodates standard UK wall depths, single-gang back boxes, and most junction box installations without needing to drill from both sides of the material. The yellow powder-coated finish identifies the Knightsbridge range and provides corrosion protection during storage between jobs.\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\u003e70 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\u003e70 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_1474284_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 70mm holesaw requires the Knightsbridge HSARBORL arbor to mount onto a drill chuck. The arbor is sold separately and carries the pilot bit and threaded shaft that the holesaw screws onto.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat materials can it cut?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe bi-metal variable teeth cut steel, stainless steel, die-cast metals, hardwood floors, plywood and rigid plastics up to 38mm thick. It is not suitable for masonry, brick or concrete.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat drill speed should be used?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor steel and stainless steel, use low speed (200-400 RPM) with cutting lubricant. For wood and plastics, use medium speed (400-800 RPM) without lubricant. Excessive speed overheats the teeth and shortens holesaw life.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be resharpened?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBi-metal holesaws are designed as consumable cutting tools and cannot be economically resharpened once the teeth are worn. Replace the holesaw when cutting becomes slow or requires excessive drill pressure.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293887652107,"sku":"HS70MM","price":7.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/1428960_c5f727af-b0ad-49b6-9097-acc1f61f2073.jpg?v=1714665546","url":"https:\/\/niori.co.uk\/products\/70mm-bi-metal-holesaw-variable-tooth","provider":"Niori","version":"1.0","type":"link"}