Air-powered series speaker poles from ultimate support are incredibly strong, sturdy, lightweight and raise and lower speaker poles on their own. The stands in the Air-powered series feature an internal shock that lifts speakers weighing 25lbs or less with no effort and only requires one hand to raise speakers weighing more than 25lbs. The new SP-100 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-100 speaker pole to be a truly universal solution.