No, the pcl-35 are just a solid pole that do fit into the cup and have a threaded end. They fit inside the sub and screw in as well. Very solid. I think they are about 36" in total length. Not height adjustable. For reference, I'm 5'8" tall and when mounted on my etx 18's, the bottom of my 12" tops is at my chest/neck area. Tops of the speakers are over my head a bit.Those are the height adjustable ones and they screw into the ETX 18 sub?