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Cobalt Drill Set, 0.5 to 3 mm — 10 pieces
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- Free US shipping
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- 30-day returns
Description
Ten cobalt bits that stop exactly where the machine stops.
Most kits at this price ship a 19-piece set running 1 to 10 mm. It reads generously right up until you notice that this chuck closes at 4 mm and the motor is 30 watts, so two thirds of those bits would never turn in this machine. You would be paying for a nice box.
This set is 0.5 to 3 mm because that is the working range of the press you are putting them in.
What is actually in the pack
Ten bits in five sizes, two of each: 0.5, 1, 2, 2.5 and 3 mm. We say five sizes rather than ten because 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. It is not M42, which is the next grade up and costs several times this.
- 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.
If you need below 0.5 mm
Buy the carbide PCB bits instead. This set starts at 0.5 mm and we are not going to pretend otherwise - the very fine sizes are a different material and a different job.
Cobalt versus the carbide PCB bits
Different jobs. The carbide micro bits are for circuit board holes - very fine, very brittle, very fast. These are for metal: slower, tougher, and they bend before they snap.
If you are drilling boards, buy the carbide. If you are drilling brass, aluminium, steel sheet or a watch plate, buy these.
Where they stop
The bits will cut harder material than the machine can push them through. On a 30 W press the honest limit in metal is nearer 2 mm than 3, whatever the bit is made of. Cobalt buys you edge life, not torque.
About the photographs
These are the manufacturer's. Ours are not taken yet, and we would rather say so than let you assume otherwise.
Delivery on this item
6 to 10 business days. These ship from stock, so they are faster than the machine.
Shipping and returns
Shipping is free on every US order. Orders leave within 1–2 business days and delivery typically takes 5–15 business days. You get a tracking number by email as soon as your order ships.
Returns can be requested within 30 days of delivery. The item must be unused, in its original condition and in its original packaging. Email us at support@arvonelle.com before sending anything back. See our Shipping Policy and Refund Policy for the full details.

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Free US shipping
Every order ships free within the US, with tracking.
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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.