I was afraid of having to QQE front for something not that the speaker will likely fall if one looks but made, there are soft stickers to stick on the parts that shake the walls. So the speaker is not likely to be damaged on the sides and no risk of slipping, ca holds great. When I think that in the manual, they say it is necessary to screw the enclosure to the brackets to fit. Anything. We spend hundreds of dollars to buy the kit and they want to be pierces the speakers. Anyway, it's good solid stuff. My speakers are 5Kg but these devices serve speaker has 25Kg