This round bathroom copper sink has a standard 1.5"" diameter hole at the bottom center and it does not have an overflow system. This hammered bathroom copper sink is a beautiful piece of art. The hammer footprint is very visible. The reddish/oxidized texture is characteristic of natural copper when it is cooled down from red-hot temperature using cold water, technique in use by the copper-smiths. The rim is flat, allowing it to be under-mounted.This copper sink was made from one sheet of copper, raised with the artist hammer, there are no welded joints. The finish is in a dark brownish color, which hides partially the natural copper-looking, but it gives it an antique look. 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).