The SC-RMAA (rackmount pole insert clamp) comes with a set of these.
To fit almost all existing pole sizes into a tube.
It's good Thomann sells these spare parts, because Gibraltar is sloppy.
I bought a complete rack (not at Thomann).
It came in the original box, equipped with the 2x RMAA's, but only with the 1-inch inserts installed. The other 2x2 inserts where not included.
That's cheating your customers Gibraltar!
And therefore I had to buy these inserts. They're quite cheap I'd say.
And strong. The kind of plastic even your dog won’t chew up too easily.
It also grips the metal inserted pole very well, without damaging it.
I just wished they would sell the 3 different sizes separately….
Well Gibraltar will never do that, but maybe an idea for the Thomann sales team?