●✔ Easy to Install ---- Just tuck the four speaker feet under the corners of the speaker or any other HI-FI device, No tools or adhesives required, so youll never have to deal with loud noise and vibration again. ●✔ Made of aluminum alloy which makes these amplifier feet durable, fadeless and hard to oxidize, increase the height of the amplifier for true stereo surround sound. ●✔High quality material enables these 4 foot pieces to function for a long time. Helps to absorb shocks. Decouples loudspeakers audibly from the ground and prevents them from vibrating and droning ●✔Prevents the transmission of unwanted vibrations from the loudspeaker boxes, noise killer, all hi-fi components are decoupled from low-frequency vibrations ●✔The screw is fixed the amp and the pads ,under your amp feet,there will be 4 screw female sockets,it is for these screws