The BMS10A adapter mounts loudspeakers of up to 11 pounds to a microphone stand. The BMS10A fits the 5/8", 27-thread standard and comes with a 3/8"-16 European thread adapter. The BMS10A comes with 2 - 5mm screws needed for mounting.The BMS10A also supports MG10/2, MG8/2FX, and the STAGEPAS 300 mixer on mic stands. BMS10A is sold as a single unit.