Sinks with 2" drains can be used as galley or head sinks. 2" drains are the standard size drain for most sinks Europe and the rest of the world.
The name, 2" Drain, does not refer to the specific size of the hole in the sink or diameter of the drain, but is used as a standard term.
If you need a configuration that is not shown, simply ask your sales representative for options. Minimum annual commitment and additional lead-time may be required for non-standard configurations.