Countersink bits are one of those tool you need but you never want to spend money on them. I found a few really nice set you might be interested in. They don't cost much, but work surprisingly well. Links below.

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Reference Sources:

Supplies:
TOOLDO Countersink Drill Bit Set (Orange Set) - https://amzn.to/3lVfbum
TOOLDO Countersink Drill Bit Set (Green Set) - https://amzn.to/3ibPgxA
FTG USA Wood Countersink (these are nice too) - https://amzn.to/3kIxuDO

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