Originally Posted by
Polaris OBark
I have this. Unless I am mistaken, it is a conventional seat post clamp that attaches to the seat tube, which is why it has that lip at the top.
From the horse's mouth:
https://www.salsacycles.com/products/post-lock
Our Post-Lock is a bicycle rack attachment point that can be positioned anywhere on your seatpost to provide a mounting point. Post-Locks do not have a lip like our Lip-Lock, Flip-Lock, and Rack-Lock so therefore cannot be used as a seatpost clamp.