They work fine on an extreme pole I had an issue with it being Becker than an extreme putting strain on the clamp body but I've put it down to it being split before I changed the brush,the Xline brush mono version cleans like a flocked brush in other makes but not being flocked it holds next to no dirt in the bristles. Far far less scrubbing is required with this brush the videos showing it being used on YouTube are demonstration purposes only,literally a couple of scrubs gets the job done IMO he best brush available at the moment usable on leads fantastic on Georgians and plain glass it floats over bars on Georgians even the bigger timber divides. Normally I try these heavier brushes for a house and take it off the pole again coz it just feels like another heavy brush but not this particular one it's good.