The IDEAS for 💎 DIAMOND DRILL BITS use

What different shapes of drilling bits are for? My ideas for various domestic purposes (not orthopedics or dentistry) application.

Timing
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00:20 big disk
02:26 middle disk with holes
03:29 sintered disk
06:53 small disk
09:22 bullet (grenade)
10:19 concave (inverse globular)
11:00 needle (cone long)
12:38 globular
14:02 cylinder

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