The extension tube has a diameter of 1.377" to accommodate speaker cabinets with a flange socket. The height is fixed with a safety hook and secured with a low-noise, backlash-free clamping screw. The slim design of the clamp enables space-saving transportation and ensures a stylish appearance. The usable height is between 42.913 and 70.472" and can be adjusted in 4 steps of 6.889". A useful mounting aid protects the speaker from scratching.