{"product_id":"diamond-tipped-drill-bits-10-of-one-size","title":"Diamond-tipped drill bits — 10 of one size","description":"\u003cp\u003eFor the materials a twist drill cannot touch. Glass, stone, sea shell, mother of pearl, ceramic, tile, bone, and the hard beads used in jewellery. A normal steel bit skates on those and then cracks them. These do not cut at all — the tip is coated in diamond grit and it grinds its way through.\u003c\/p\u003e\n\n\u003ch3\u003eHow to actually use them\u003c\/h3\u003e\n\u003cp\u003eThree things decide whether the hole comes out clean or the piece cracks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWater.\u003c\/strong\u003e Keep the tip wet. A shallow puddle on the work, or a drop added every few seconds. A dry diamond bit overheats, the grit comes off the tip, and the bit is finished in under a minute.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLight pressure.\u003c\/strong\u003e You are grinding, not drilling. Let the weight of the quill do the work. Pushing harder does not speed it up, it chips the underside.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eModerate speed.\u003c\/strong\u003e On this press the middle of the range is right. Faster is not better with diamond — heat is what kills both the bit and the workpiece.\u003c\/p\u003e\n\n\u003ch3\u003eWhat fits what\u003c\/h3\u003e\n\u003cp\u003eThe shank is \u003cstrong\u003e2.35 mm\u003c\/strong\u003e, the standard rotary-tool size. It goes straight into the 0.3 to 4 mm chuck on the Mikrabench drill press, and into any rotary tool that takes a 2.35 mm collet.\u003c\/p\u003e\n\n\u003ch3\u003eWhat these are not for\u003c\/h3\u003e\n\u003cp\u003eNot for metal. Not for steel of any kind, hardened or soft. Not for wood, where they will burn rather than cut. For metal use the cobalt set or the PCB bits — different pages, different job.\u003c\/p\u003e\n\u003cp\u003eThey are also consumable. Ten of one size is the pack because you will go through them: how fast depends entirely on how wet you keep them.\u003c\/p\u003e\n\n\u003ch3\u003eWhich size\u003c\/h3\u003e\n\u003cp\u003ePick the diameter above. Every pack is ten bits of that one size, not ten different sizes — you break the size you are using, not the ones you are not.\u003c\/p\u003e\n\n\u003ch3\u003eYour size is not in the list\u003c\/h3\u003e\n\u003cp\u003eThe full range runs from 0.4 mm to 3 mm in tenths. We stock the sizes people actually ask for. If you need 0.7 or 1.4 or anything else in between, \u003ca href=\"mailto:support@arvonelle.com\"\u003ewrite to us\u003c\/a\u003e and we will get it and put it on the shelf. It takes about a week.\u003c\/p\u003e\n\n\u003ch3\u003eShipping\u003c\/h3\u003e\n\u003cp\u003eFree and tracked across the US, about a week. These come from stock, not from the workshop that builds the machine, so they arrive well before it does — and in their own parcel.\u003c\/p\u003e","brand":"ARVONELLE","offers":[{"title":"0.5 mm","offer_id":46221278609599,"sku":null,"price":16.99,"currency_code":"USD","in_stock":true},{"title":"0.8 mm","offer_id":46221279035583,"sku":null,"price":16.99,"currency_code":"USD","in_stock":true},{"title":"1.0 mm","offer_id":46221279068351,"sku":null,"price":16.99,"currency_code":"USD","in_stock":true},{"title":"1.2 mm","offer_id":46221279101119,"sku":null,"price":16.99,"currency_code":"USD","in_stock":true},{"title":"1.5 mm","offer_id":46221279133887,"sku":null,"price":16.99,"currency_code":"USD","in_stock":true},{"title":"1.8 mm","offer_id":46221279166655,"sku":null,"price":16.99,"currency_code":"USD","in_stock":true},{"title":"2.0 mm","offer_id":46221279199423,"sku":null,"price":16.99,"currency_code":"USD","in_stock":true},{"title":"2.5 mm","offer_id":46221279232191,"sku":null,"price":16.99,"currency_code":"USD","in_stock":true},{"title":"3.0 mm","offer_id":46221279264959,"sku":null,"price":16.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0760\/5826\/3743\/files\/Sb14694e1071d451cb4a652888f683421A.webp?v=1789641727","url":"https:\/\/arvonelle.com\/products\/diamond-tipped-drill-bits-10-of-one-size","provider":"ARVONELLE","version":"1.0","type":"link"}