This round kitchen copper sink has a standard 3.75 diameter hole at the bottom center, it fits the 3.5" diameter drainage size. The rim around it is about 1.5", so the internal dimension is 15" diameter x8" depth. The copper sheet is 18 gauge (0.04" thickness). The finish is in weathered copper, which is antique-looking. If scratched, it will heal by itself, if it does not, we have a way to repatinate it back!From a copper sheet the wise artisan hands transform it into this unique piece. It is designed to be either over-the-counter or undermounted because the rim is flat.This copper sink was made from one sheet of copper, raised with the artisan's hammer, there are no welded joints.IMPORTANT NOTE: The patina can be damaged faster if abrasive substances are used to clean it, because of this, we recommend rinse it with water and soap only!"