MaterialAudio isolation feet made of aluminum, featuring removable non-slip rubber rings, high hardness, high density, low harmonic vibration point, and high damping. Each speaker spike pad can support up to 220 lb, allowing one isolation foot to support around 880 lb. Middle Hole: 4.5mm (0.17 inches). Applicable objectsSubwoofer feet, audio equipment feet, amplifier feet, speaker feet, turntable isolation pads, CD/DAC/AMP/DVD players, cassettes deck, recorders, home audio riser pads, isolating speakers, subwoofer isolation feet, PC case feet, audio isolation feet, and other audio equipment. With Single-sided Adhesive And ScrewsThese adhesive speaker feet come with single-sided adhesive and screws, making it easy to attach them to the chassis without drilling holes. Reduce VibrationUsing these aluminum speaker feet optimizes the true sound of stereo equipment. The music will be more focused with less noise, and the isolation feet effectively reduce vibration for all sensitive equipment