Dayton Audio DSS3-BC Black Chrome Speaker Spike Set 4 Pcs. Rigidly coupling a loudspeaker enclosure to a floor by means of a "spiking" system dramatically improves clarity, stereo imaging, and bass response. This is especially apparent with subwoofer systems. These attractive spikes are precision machined from solid brass and then plated with a durable finish. Barbed insert nuts and 6 mm threaded studs are included for mounting in cabinets with walls up to 1" thick. Set includes four cone spikes, four floor discs, four barbed insert nuts, and four threaded studs. • Dimensions: 9/16" diameter, 1-5/16" high (including disc).