bolt thickness? 3/8"?

Thank you very much for your question. The bolt of this magnet is metric M8. For D3/8'' thread , see the following link: https://www.amazon.com/dp/B08JSNK6YK?ref=myi_title_dp

Is it the neodymium magnets?

I cannot tell, the base is covered with steel over the magnet. It is very strong and the thicker the metal the stronger it holds. I think they are a great value. Using mine to hold LED portable lights I use.

Are these strong enough to be used as a rooftop light bar holder for speeds at/near 60 MPH?

Light bars may weigh ounces to many pounds with a wide range of air resistance so an accurate answer is impossible . However, I can say, this magnet is very, very strong! I have to pry it off a steel plate with pliers. Suggestion....if using on your vehicle put very thin rubber mat under it so it doesn't leave a rust mark or scratches. Also, there are larger, stronger ones on Amazon.

What is the pitch size of the thread. M-8 x 1.25 or M-8 x 1 ?

Interesting that supplier has not replied. Mine were 1/4-20 on a different magnet. From the pictures they appear to be more 1.25 coarse than 1.00 fine thread.

MUTUACTOR 2PCS Super Strong Neodymium Magnet with 1/4''-20 Male Threaded Stud,185lb Pulling Force Magnetic Mount Heavy Duty Magnets for Led Lighting Camera Tools and Others Equipments

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