Overview 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).