The ideal standard gauge
The standard gauge describes the thickness of a metal sheet, on a scale from 8 to 30. The lower the number, the thicker the metal sheet. The thicker it is, the less it can be bent or dented and the quieter it is in use. But if too thin, it becomes impossible to produce a sink from a single sheet of metal.
Deep-drawn sinks in full size have a standard 18-20 gauge
Hand-made sinks have a standard 16-18 gauge
Smaller accessory bowls are standard gauge 18-22