This is a universal mounting bracket for connecting two different half-rack products. This mounting interface connects an extruded chassis to a side-mount chassis. It is a C-channel bracket with flanges that are compatible with the variety of Shure PSM series receivers, and other Shure 1/2 space rackmount products.
WA504 - Rackmount Interface for PSM Series 1/2 Rack Space Transmitters
Set of Mounting Screws