This bathroom copper sink has a standard 1.5 diameter hole at the bottom center and it does not have an overflow system. It is designed for above-the-counter mounting because of its apron, which sits all the way around the vanity top. Hammering the red-hot copper is an ancient technique the copper-smiths still use, where no power tools are used, just the furnace to heat the copper and a hammer to give it the shape. We got this bathroom copper sink from the skilled copper-smiths from Santa Clara del Cobre, Mexico. The finish is in a dark brownish color. Suitable for your bathroom, it will add a unique home accent making it a very special point of attraction in your bathroom. The copper sheet is 16 gauge (0.05" thickness)."