This is the EWI Tourcase AMS-001A-PIN Speaker stand height adjustment pin.
The pin is an exact replacement for the EWI AMS-001A-NB speaker stand but should work for other stands as well.
The .275" (7mm) diameter steel pin is 2 1/4" long with machined grooves that are spaced for standard 1 3/8" tubing. A four inch nylon strap is attached to the pin with metal rings.