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document updated 3 months ago, on Aug 2, 2024

countersinking

Reference — What angle of countersink do I need? 60°, 82°, 90°, 100°, or 120°?   [2].

holes < ~¼"

The sort of holes that you need a pin vise to drill.

For these, I like to use a rotary tool bit (AKA rotary burr):

holes from 1/4" to ~1.5"

These "zero flute" cutters seem to work really well — but only for wood, not metal: