{"product_id":"a2-size-arbor-with-6-3mm-pilot-drill-bit-11mm-hex-shank","title":"A2 Size Arbor with 6.3mm Pilot Drill Bit - 11mm Hex Shank","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Knightsbridge A2 arbor is a steel drill accessory that connects holesaws to standard power drills, combining an 11mm hex shank for the drill chuck with a threaded collar for the holesaw and a 6.3mm high-speed steel pilot drill bit at the centre. The pilot bit drills a guide hole first, keeping the holesaw centred during cutting and preventing the saw from wandering across the material surface.\u003c\/p\u003e\n\u003cp\u003eDesigned for use with Knightsbridge holesaws from 32mm to 90mm diameter, the arbor suits electricians, joiners and tradespeople fitting downlights, cable entry points and socket back boxes in plasterboard, timber and composite sheet materials. The 11mm hex shank fits standard 13mm keyed and keyless drill chucks and resists spinning under load better than round shanks. The arbor measures 128mm total length with the pilot bit extended.\u003c\/p\u003e\n\u003cp\u003eThe arbor body is machined steel with a black oxide finish to reduce surface corrosion during storage. The threaded collar accepts Knightsbridge holesaws with A2-compatible threads — not all holesaw brands use the same thread pitch, so check compatibility before pairing with non-Knightsbridge saws. The 6.3mm pilot bit can be replaced if it becomes blunt, though the arbor and bit are sold as a combined unit.\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\u003e34.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e128 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\u003eBlack\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_1474307_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 holesaws is this arbor compatible with?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe A2 arbor fits Knightsbridge holesaws from 32mm to 90mm diameter with A2-compatible threads. It is not compatible with holesaws from other manufacturers unless they explicitly use A2 threading, as thread pitch varies between brands.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the pilot drill bit for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 6.3mm pilot bit drills a guide hole through the material before the holesaw teeth engage. This keeps the holesaw centred and prevents it from skating across the surface at the start of the cut, particularly on smooth materials like plasterboard and MDF.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the pilot bit be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe pilot bit is press-fitted into the arbor body and can be knocked out and replaced if it becomes blunt, though replacement bits must match the 6.3mm diameter and length. The arbor and bit are sold as a combined unit here.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat drill chuck size is needed?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 11mm hex shank fits standard 13mm keyed and keyless drill chucks. It does not fit smaller 10mm chucks or impact driver hex bit holders without an adapter.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293888504075,"sku":"HSARBORL","price":5.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/109244_042cf857-83f8-4f4e-82ea-c4fbb75101ef.jpg?v=1714665563","url":"https:\/\/niori.co.uk\/products\/a2-size-arbor-with-6-3mm-pilot-drill-bit-11mm-hex-shank","provider":"Niori","version":"1.0","type":"link"}