I was surprised that the microphone holder was not included. Is that standard? Can anyone recommend what I should buy there for a normal radio microphone for an attachment? Thank you very much!

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Answer

Normal microphone, is a broad term. What you need is a transitional government from your thread to your microphone holder, which in turn holds your microphone. With the thread you are flexible in what you want to attach. 
You will certainly find something suitable under microphone accessories.

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Question about K&M 25400 Mic stand

I was surprised that the microphone holder was not included. Is that standard? Can anyone recommend what I should buy there for a normal radio microphone for an attachment? Thank you very much!