Ambassador Marine drains are made from heavy duty plastic, brass and/or stainless steel. They offer any configuration you might need. The drain flanges are available in a variety of finishes, to match Ambassador Marine sinks and your decor. Sinks with 3.8cm drains are generally used as head sinks. 3.8cm drains are the standard size drain for lavatory sinks in North America. Sinks with 5.1cm drains can be used as galley or head sinks. This is the standard size for most sinks in Europe and the rest of the world.