Sturdy steel construction. Easy for storage and transportation. Save space by easily mounting two loudspeakers on top of the speaker stand. With standard 35mm 1 3/8" pole, it fits most loudspeakers such as 6" or 8" or 10" or 12" PA speaker cabinets. 40mm diameter mount tube fits most standard speaker stand or speaker pole. Secured by locking knob. Distance between 2 poles: 15 - 21 inch (38 - 53 cm). Adjusted to your desired width by allen key provided in the package.