Original Series speaker poles from Ultimate Support are amazingly strong yet lightweight thanks to their oversized, thick-walled aluminum tubing Original series stands are everything youd expect from Ultimate Support speaker poles: Strong, sturdy, lightweight, and 100% field serviceable. The new SP-80 speaker poles feature an expanding cylinder system that will firmly fit multiple speaker sockets from 1-3/8 to 1-1/2 diameter. Using a 2mm hex wrench, the adapter can also be removed to provide standard M20 threading, allowing your SP-80 speaker pole to be a truly universal solution.