SimplyCopper 15" Square Copper Bar Prep Sink with Fleur de Lis Design -- 2" Drainhole SimplyCopper 15" stylish bar and prep copper sink is designed for everyday living. This Bar/prep sink is designed to be the perfect size for any kitchen design. Handmade from 18-Gauge copper this sink is designed to last . Installed as a drop-in or under-mount. Outside Dimensions: 15" x15"; Inside Dimensions: 13" x 13" / Depth: 7" (not a true geometric square) Drain Opening: US standard 2" 18 Gauge Copper Shown in Aged Copper Installation: Drop In / Under Mount (1" flat lip)