60° countersinks could have different shapes. Here are some examples to help you find one. If you really can't find one then use a standard 45° countersink.
First image is an example of standard 60° countersink:
The outer diameter must be in the range of 3.5 to 6.5mm.
The second image is an example of center drill bit which is generally at 60°:
The diameter at the end must be less than or equal to 1.5mm.
The third image is an example of a 60° CNC milling cutter:
The outer diameter needs to be in the range of 3.5 to 6.5mm.
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