Quantity: 4PCS,A set of 4 spikes offers comprehensive isolation for multiple audio components. Diameter: 44mm, Height: 25mm (Adjustable),44mm diameter and 25mm height provide a stable base for your audio equipment. Mounting Screw: screw (Free Provided),Comes with screws for easy installation, ensuring a secure fit for your audio gear. : Anodized, Shiny,Anodized ensures a shiny, that resists and wear. The purpose of using isolation spikes is to suspend acoustic feedback from your speakers or sub-woofer. They can be installed to separate your turntable, CD player, amplifier or other audio components from vibration. Therefore, the tones will be more focused and tighter. And, there will be much less noise to be transferred to other rooms from the floor. Application: Set up the spikes beneath the equipment as same as the demonstration. No drill is needed. No adhesive substance is recommended, as it may influence the isolating effect. Screw to adjust the spikes to make secure contact with the floor Solid Aluminum Alloy material promises high specific (density) Color: Silver + Gold Material: Aluminum Alloy Package Contents: 4 x Speaker Spikes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.