About this item MaterialIsolation feet made of aluminum, featuring a removable non-slip rubber ring, high hardness, high density, low harmonic vibration point, and high damping. One set of speaker feet pads can support around 400kg/880lb. Middle Hole: 4.5mm (0.17inch) Applicable objectsSuitable for subwoofer feet, audio equipment feet, amplifier feet, speaker feet, turntable isolation feet pads, CD/DAC/DVD players, and other audio equipment. Reduce VibrationIsolation feet effectively reduce vibration for sensitive equipment. Experience more focused music with less noise, eliminating pollution between the ground and the speaker, resulting in tighter and cleaner sounding bass. Installation OptionsThe isolation feet offer two types of installation: one using M4 screws (for cases where the screws match the holes in the audio device) and the second using single-sided 3M adhesives (for cases where the screws do not match the holes). Please check the size of the screws carefully. Perfect Look