To be used in pairs with straps to mount a light bar vertically to speakersThe tripods for the stage lights were often "in the way" and we needed an alternative way of mounting the stage lights (LED PAR cans) to speakers.Can be mounted either flat on or in a 45 degree angel depending on preferences.Equiped with center hole to fit the back side of screw and wingnut from the can's which also fixes it safetly.Just print two and buy two straps (i.e http://www.clasohlson.com/se/Sp%C3%A4nnrem/Pr351281000) for each light bar.