Drill bits are sold in packages of two or a box of many. Buy the box.
Caution: Eye protection is a must as these bits don’t just break, they explode when they expire
When you choose one, mark the chuck end with a felt pen. That way when you’re done and return it to the box you can find it next time. Using them this way extends the life of the box as you wear them down one at a time. I have a sneaky suspicion that the steel used today is not the quality of yesteryear.
Rule of thumb regarding drill bits, the smaller the bit, the higher the speed.
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