The 3/8-16 Spike with Nut is used on the Alexia Series 1, Maxx, Mezzo, Polaris, Sasha, Sophia, Watchdog, Watt/Puppy, X-2, XLF and Yvette Products. This is for 1 Spike with nut. If you need enough for 1 channel, then your order quantity is 4. If you need enough for a pair of speakers, your order quantity is 8.