I bought this clamp just to connect 2 shorter rack pipes into 1 longer pipe.
I read 'Extension clamp', so I thought I might be good.
But after seeing a video of that Gibraltar guy explicitely warning this should not be used as a horizontal extension when you're going to put weight on it (and that's what almost everyone does), and is only meant for vertical pipe extensions, I knew I bought this for nothing. Because that's not the kind of build I'm planning.
Thomann should add that information!