Xtra Boom

From Latch Lake:

The Xtra Boom is Latch Lake's go-to product for mic arrays and tricky mic placement. It's an accessory boom that enables you to hang multiple microphones from one stand featuring a single lever lock system adjusting the extension, orientation and spin of the boom. Then locks it firmly in place. It will attach to any stand ranging from 5/8" to 1 3/16". Xtra Booms prove to be very useful in micing drums, vocal shootouts, guitar amps and custom/standard arrays. Available in 12", 18", and 24" lengths.