Seat post clamp.

[Msdevery]

I need to replace the quick release seat post clamp on my Addmotor M150 foldable bike. Anyone know the diameter?

 

[tomjasz]

I need to replace the quick release seat post clamp on my Addmotor M150 foldable bike. Anyone know the diameter?

A $9.09 digital caliper ought to be in every toolbox. See Amazon.