12PCS Speaker Stand Slotted Mounting Plate Tray for Moving Heads and Speakers

The ProX X-SSMP Speaker Stand Mounting Plate for Speakers and Accessories is Exterior cabinet stands mounting flange with tightening knob, for 1 3/8 diameter speaker stand top tube.   These can be used to mount studio-style speakers, lighting, accessories, and could be used with a platform to mount projectors.   Will not break like the ones made of plastic!

Speaker stand shown for illustration purposes only and is not included!

Caution:  Do not overload your speaker stands and always extend legs out fully so that lower braces are horizontal to the floor. ...
https://www.proxdirect.com/products/view/1611/12PCS