This kitchen copper sink has two standard 3.75 diameter holes, one per bowl. The border is about 1.25" wide, all the way around it, with small differences in the corners. The bigger bowl is 17.5" long by 16" wide by 10" deep. The smaller one is 15" long by 11.5" wide by 8" deep. The copper sheet is 16 gauge (0.064" thickness and the bottom of both bowls is rounded as shown in the last picture.The reddish/oxidazed texture is characteristic of natural copper when it is cooled down from red-hot temperature using cold water, that specific characteristic is what makes it so beautiful.The techniques used by the copper-smiths is the same one used for several centuries, where no sophisticated tools are used, just the furnace to heat the copper and a hammer to give it the shape. The finish is in a dark brownish color. Along your home decoration, this piece it will add a unique touch to your kitchen making it a focal point.The patina can be damaged if any abrasive substances stay for long periods of time on the sink surface, because of this, washing it after usage is recommended; besides that, no more maintenance is required."Hand-hammered and mold-cut to perfectionHandcrafted by Mexico''s Finest ArtisansWe include 1" long brown screws in all of our hammered copper switch plates