I'm using the mounts with heavy Polk Audio monitors and with the side clamps it handles the speaker like a champion and they look really nice!
Do not recommend product
Product did not work through the radio unless you used an audio cable. Sound was very distorted. Would not recommend !!! I am going to return item.
Even though they are light weight, these stands are well built and definitely heavy duty. I used them in my home theater room to raise my front speakers off of the floor, and they made a significant improvement.