MaterialAudio isolation feet made of aluminum, featuring removable non-slip rubber ring. With high hardness, high density, low harmonic vibration point, and high damping. One isolation foot can support around 400kg/880lb. Middle Hole: 4.5mm (0.17 inch). Applicable objectsSuitable for subwoofer feet, audio equipment feet, amplifier feet, speaker feet, turntable isolation feet pads, CD/DAC/DVD players, isolating speakers, subwoofer isolation feet, PC case feet, and other audio equipment. With Single-sided 3M Adhesives/M4 screwsThese turntable isolation feet offer two types of installation: M4 screws or single-sided 3M adhesives, making it easy to attach speaker feet to chassis without drilling holes. You can freely choose the right installation method for your audio equipment. Reduce VibrationUsing aluminum speaker feet optimizes the true sound of stereo equipment, making music more focused with less noise. Subwoofer foot isolation effectively reduces vibration for all sensitive equipmen