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$16.99
Free US shipping
Cobalt Drill Bit Set, 0.5 to 3 mm, 10 Pieces
$16.99 USD
$16.99 USD
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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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Description
Ten cobalt bits that stop exactly where the machine stops.
This set is 0.5 to 3 mm because that is the working range of the press you are putting them in. The chuck closes at 4 mm and the supply in the box gives about 24 watts, so every bit in the pack is one the machine will actually turn.
What is in the pack
Ten bits in five sizes, two of each: 0.5, 1, 2, 2.5 and 3 mm. A spare of each is the useful thing at this scale - fine bits break, and the one you break is always the one you needed.
- High-speed steel with 5 percent cobalt (M35). Cobalt is what you use when plain HSS goes blunt on the second hole - harder metals, stainless, anything that work-hardens.
- Straight shank. Fits the 0.3 to 4 mm chuck directly, no adapter.
- 135 degree split point so they start where you put them instead of wandering.
Which of our machines
These go in the Mikrabench Mini Drill Press, the one with the 0.3 to 4 mm chuck. Fits chucks only: the Collet and Micrometer presses hold 3.175 mm shanks, so for those two machines, use the carbide PCB bits.
Cobalt or carbide
Different jobs. The carbide micro bits are for circuit board holes and for sizes below 0.5 mm - very fine, very brittle, very fast. These are for metal: slower, tougher, and they bend before they snap.
If you are drilling boards, choose the carbide. If you are drilling brass, aluminum, steel sheet or a watch plate, choose these. In metal on this press, the sizes up to about 2 mm cut best; cobalt buys you edge life, not torque.
Need one particular diameter
Write to us and we will try to get it. Both cobalt and carbide bits are made in hundredths of a millimeter; we stock the round sizes because that is what most people need.
Tell us the diameter at support@arvonelle.com and we will tell you what it costs and how long it takes before you pay anything.
Delivery
Free and tracked, to the United States, Australia, New Zealand and Canada. One to two weeks. Small items like these ship on their own 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.
