K&M 21329

Stronger than I expected.
With 35 killo load limit. I got a 50cm and a 25cm to make a 75cm rise. Loaded with my heaviest top, ?? Killo, a big JBL, and there is no signs of wobble or slack. These ext tubes seem to lock together, presision engineered for this sort of work maybe, but looking good too, and I can leave my old speaker stands @ home.
I am solo guitar & looper, strictly minimum sound gear for quick setup & tare down. Indoor venues need minimum floor use, these riser tubes are great for this. Screwed into my sub, and Thomann sensible prices, its all good.

PRO's
For when high enough is not quite high enough. Like amps that go to 11 the K&M gets your noise that extra foot off the floor. (saves digging a pit for the audience or putting the talent on a box.)

It gets you higher and saves you work!

CONS

Makes those stands that bit taller, FOH Hobbits may struggle.

very well made and so strong with no movement at all

Does what it is meant to do. But VERY hard to unscrew with your bare hands. You need to push a long rod through the little holes at the sides to get some torque.

I'm using this extension tube with a K&M 21430 microphone stand to gain a little extra height on the main vertical pole. Suitably sturdy.