Square Copper Sinks are available in both drop in or undermount styles. 18 inch Gauge copper. Outside Rim Measures 15 x 15, Inside Measures 13 x 13 x 7 deep. The edge on the drop in style measures 1 inch. The drain opening is 1.5 inch standard size. Our Rustic copper sinks are hand hammered and made by artisans in Mexico. They are beautifully crafted, and complement our rustic vanities quite well.