These are a few brands that have decent bits.
There are 50 or so more brands and vendors.
You can buy at Amazon, direct or at 100 or so more places.
Depending on size and style of whatever you are wanting to do - you can get 120 degree, 90, 60, 30 15 degree angles, some are pointy tip, some are rounded tip.
Without a specific example of what you want to do, it's difficult to make any sort of specific recommendation.
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