Free/Fixed Bike Wheel: Which side is fixed?

Ethan H

New member
I recently purchased some bike wheels on the internet and according to the seller, they had a fixed/free hub. I'm looking at it now and both sides appear to allow a cog and a locking ring, both sides have 2 threaded parts, one stepping down and reversing thread direction.

Which side is the fixed side? Did I actually purchase a fixed/fixed hub?
 
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