They mount on the wall (solidly into framing) and hooks on the back of the sink catch the pocket at the top of the bracket, typically. Gravity (which there is plenty of with a cast iron sink) does the rest. It should be more obvious looking at the back the matching sink.


In the end I stumbled across the term "Zero Clearance Door" which led me to https://www.frigidaire.com/Owner-Center/Product-Support/LFMV1846VF This fits perfectly up against a blocking cabinet, or a wall - if you're unlucky enough to live somewhere not up to code...

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