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$16.99
Free US shipping
Diamond Drill Bits for Glass, Sea Glass, Stone and Shell, 10 of One Size, 2.35 mm Shank
$16.99 USD
$16.99 USD
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★★★★★ 5.0 from our Etsy buyers
30-day returns
A part breaks in the first year? We send a new one free
One to two weeks, tracked. Shipping is free.
30-day returns
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5.0 · 1 review
“Good quality! Good customer service! Good shipping speed!”
— Jalen, verified buyer on Etsy
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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 jewelry. 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 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.
For metal, use the cobalt set or the PCB bits; for wood, a twist drill.
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 Mini Drill Press, and into any rotary tool that takes a 2.35 mm collet.
For the Collet and Micrometer presses, which hold 3.175 mm shanks only, choose bits with a 3.175 mm shank.
Which size
Seven diameters, 0.8 mm up to 2.5 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, and how long a pack lasts depends on how wet you keep them.
If you are drilling pearls and shell, the work sits between 0.8 and 1.2 mm. Stone cabochons and tile want 1.5 mm and up. At 0.8 mm the bit is thinner than a pin, so clamp the work.
More sizes on request
0.4, 0.5 and 0.6 mm at the fine end, 1.1 mm in the middle, and 3 mm at the top are listed as sold out, and intermediates such as 0.7 and 1.4 mm are made too. Write to us for any of them and we will get one in, about a week.
Delivery
Free and tracked, to the United States, Australia, New Zealand and Canada. One to two weeks. These travel in their own parcel and usually arrive before the machine does.
30-day returns from the day it arrives. Return postage is yours, the price of the item comes back in full.
Shipping and returns
Free tracked shipping on every order to the United States, Australia, New Zealand and Canada, with no minimum. A few items ship to a shorter list of countries, and their page says so.
Orders leave within 2 business days. The delivery time for your country is shown under the price of each item. In the United States the Mini Drill Press, the lathes, the XYZ and XYZR micrometer stages and many of the tools ship from US warehouses and arrive in about a week or less. Items shipped from overseas take one to two weeks, a few larger ones two to four. You get a tracking number by email as soon as the parcel is scanned.
30-day returns from the day it arrives, unused and in its packaging. If it arrived damaged or faulty, we pay the return label. If you simply changed your mind, you pay the return postage and get the full price of the item back. Email support@arvonelle.com before sending anything back.
Before you order
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 what you pay. For Australia and New Zealand nothing is added at checkout. If a carrier ever asks you for a fee on one of our parcels, don't pay it: email us first and we sort it out.
What if a part breaks? For twelve months, tell us which part and we post a new one free. No return needed.
Can I cancel? Yes, within 24 hours of ordering, no questions asked.
How do I reach you? Write to support@arvonelle.com or use the chat. A real person answers within one business day.
If something goes wrong
J
Good quality! Good customer service! Good shipping speed!
