The BMS10A is designed for mounting the STAGEPAS 300, STAGEPAS 500 and MG82CX mixers on mic stands. BMS10A is sold as a single unit. The BMS10A adapter mounts equipment 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 two 5mm screws needed for mounting.