There are numerous elements of the proximity kitchensystem shown - the Basin is 16 gauge prime stainless steel, bent-and-welded construction. The Basin drops perfectly into a standard 36" sink base cabinet, hanging on it's rim. No fasteners necessary. The photo shows the Basin mounted below our Standard Counter in teak. The Standard Counter is
also available in 14 gauge stainless, welded directly to the Counter. The Board slides the full length of either Counter, and the Carrier and Vessel assembly shown is for the Gaggenau steamer inserts. Carriers are also available for 1/6, 1/3, 1/2 and 2/3 standard Gastronorm steam table inserts in 2 1/2" and 4" depths. Cabinetry shown is part of the system as well, but the question was about the sinks.

I hope this helps.