Combination drill and tap.
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Tee forming drill - GIF and video
0.004" micro drill bit - photo
Hot twist forming a drill bit - GIF
Revolving drill head - photos and video
Tiny drill - photo
Free eBook: 173 Best Homemade Tools
nova_robotics (Sep 17, 2021),
Ralphxyz (Sep 14, 2021)
The electricians like those. If you need to make a million sloppily threaded holes, these are good. But they don't do that great of a job.
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