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Diamond-tipped drill bits — 10 of one size
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- Free shipping, US and Australia
- Secure payment
- 30-day returns
Description
For 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.
How to actually use them
Three things decide whether the hole comes out clean or the piece cracks.
Water. 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.
Light pressure. 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.
Moderate speed. 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.
What fits what
The shank is 2.35 mm, 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.
What these are not for
Not 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.
They 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.
Which size
Twelve diameters, 0.4 mm up to 3 mm, and 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.
If you are drilling pearls and shell, the work sits between 0.6 and 1.2 mm. Stone cabochons and tile want 1.5 mm and up. Below 0.6 mm the bit is thinner than a pin and snaps if the piece shifts, so clamp it.
A size that is still not here
The maker also cuts intermediate sizes such as 0.7 and 1.4 mm that we do not keep on the shelf. Write to us and we will get one in, about a week.
Shipping
Free 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.
Shipping and returns
Shipping is free on every order, to the United States and to Australia, tracked, with no minimum. Orders are processed within 2 business days.
After that the number depends on what you bought, and the line under the price gives it. The drill press takes about 2 weeks because we do not hold stock of it, and bits, punches and small consumables take about 6 to 10 business days.
Australia is not slower. An earlier version of this page said three to four weeks, on the assumption that further away means longer. It is the opposite: the parcels leave China, and China is closer to Sydney than to Philadelphia. Our carrier quotes 6 to 10 days to Australia against 4 to 7 to the United States, and it costs us less to send. So the Australian figures here are the same as the American ones. What we cannot claim is that we have watched it happen - we have not shipped an Australian order yet, and the day we have real tracking from there these become our numbers instead of the carrier's.
On the plug, we have to correct ourselves. This page used to say our supplier sells an Australian-plug version of the adapter at the same price. That was wrong, and we are leaving the correction here rather than deleting the sentence. It came from a different machine in a different supplier's catalogue. The listing this machine actually comes from has no plug option at all. We asked the supplier straight out and they answered that they fit a compatible plug for the destination country - which is an answer, but it is theirs, not something we have checked. The plug block further up this page says what we will do if what arrives does not fit your wall.
You get a tracking number by email as soon as the parcel is scanned, not before. A link that sits at label created for a few days is normal on this route.
Returns: 30 days from delivery, unused and in its packaging. Nothing is excluded - there is no rule here about sale items. If it arrived damaged or does not hold tolerance, we pay the return label. If you simply changed your mind, the return postage is yours and the price of the item comes back in full. Email support@arvonelle.com before sending anything back.
Before you order
Will it plug into my outlet? Voltage, yes: the supply is rated 100 to 240 V, which covers both 120 V American mains and 230 V Australian mains, so no converter and no transformer. The plug is the part we cannot promise yet. The machine has no plug option we can select when we order it. We asked our supplier and they answered in writing that they fit a compatible plug for the destination country - we are quoting them, not claiming it, because we have not yet had one in our hands. Our sample is on order. If what arrives will not go into your wall, tell us: we post you the right adapter free, or refund you in full with the postage on us. An earlier version of this answer said the supplier sells a separate US-plug and Australian-plug version at the same price. That was wrong and came from a different machine; we are leaving the correction here instead of quietly deleting it.
Can it mill? As it ships, no. Milling needs an ER11 collet spindle in place of the drill chuck, because side load pulls a bit out of a chuck. That spindle is a real part and we are sourcing it. Until it is on the shelf we do not sell collets or end mills either.
Do your vises fit the press? The ones meant for drilling do - the drill press vise and the brass vise on its XY stage bolt to the base as it comes. The bench vises do not bolt down and must not go under a spinning bit. The engraving ball vise and the toolmaker's vise are bench tools too. Every page says which it is.
Do I pay tax or duty? In the United States, sales tax is added at checkout where your state charges it, and the total you see is the total. In Australia, consignments under AUD 1,000 normally carry 10% GST collected by sellers whose Australian turnover passes AUD 75,000 a year; we are well below that, so nothing is added at checkout and nothing should be asked of you on delivery. If a carrier ever asks you for a fee on a parcel from us, do not pay it - send us the notice first and we will sort it out with you. We are not going to claim we cover all duties everywhere. We cover what we control and we tell you about the rest.
What if a part breaks? For twelve months, tell us which part and we post a new one free. No return, no inspection, no photograph of the packaging. That applies in Australia too.
Can I cancel? Yes, within 24 hours, no questions. After that it is usually already moving.
Why trust a shop you have never heard of? You should not, on our say-so. Check instead that every page tells you what the tool will not do, that each product carries its own delivery number for your country, that we say which figures we measured and which we were told, and that when we get something wrong - the plug, which spindle fits, how long Australia takes - we say what the page used to say.

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Free shipping, US and Australia
Every order ships free, with tracking, to both countries.
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30 days to change your mind
Thirty days from delivery. Unused and in its original packaging.
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A person answers
Write to support@arvonelle.com and you get a real reply, not a form.