High Quality: This speaker spike is made of carbon iron with polish and second time plating, not easy to fade and oxidation. Its surface is smooth without any burr, delicate appearance, and comfortable hand feeling..Adjustable Height: The speaker spike is designed with height fine-tuning balancing nut, able to adjust the height..Wide Application: The speaker spikes is suitable for HiFi speaker, speaker frame, amplifier, CD DVD player, turntable recorder, Chassis, Instrument, etc..Function: The speaker shock base pad is used between spike and ground, to minimize the harmful vibration..Package Includes: 4PCS Black Speaker Spikes+4PCS Speaker Spike Pads. Size: Spike screw diameter approx. M8 (8mm) x height approx. 42mm, spike base diameter approx. 20mm x height approx. 4mm.