The Allen & Heath RK19 19" Rackmount Kit is a pair of brackets for rack mounting the Allen & Heath ZED-18 and ZED-16FX mixers.
It is not mentioned, but the kit fits ZED22 and larger ZED consoles as well as ZED18 and ZED16. Though you cant put ZED22 into a 19-rack, its quite handy to install ZED22 into a table cutout in order to make a slick integrated mixing console.