How much vertical adjustment is there?

1^3/8 inches.  This allows plenty of vertical adjustment to not only install the sink but in the event you ever need to remove your sink you will be able to lower it from the countertop for removal.

Several clients have replaced “crazed” fireclay sinks or installed new sinks when existing countertops are in place.   The sink mount kit is installed with the brackets in the “lower” position then the sink is slid into the cabinet from the front to rest on the support rails.   The brackets are then adjusted “up” to mate the sink with the countertop.  This same technique is also used to rectify lite weight stainless rimmed sinks when the adhesive or clips have failed and the sink has fallen down.