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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 outer diameter must be in the range of 3.5 to 6.5mm.

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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