By rigidly coupling a loudspeaker enclosure to a floor by means of a "spiking" system, it is possible to dramatically improve clarity, stereo imaging and bass response. This is very apparent with subwoofer systems. These attractive spikes are precision machined from solid brass and then plated with a durable black finish. Each cone spike weighs 86 grams and measures 1-1/4" diameter and 1-1/2" tall. The two piece threaded tip design allows for precise level adjustment. T-nuts and threaded studs are included for mounting in cabinets with walls up to 1" thick. Set includes 4 black cone spikes, 4 black floor discs, 4 T-nuts and 4 threaded studs. Threads are M6.