Native Trails | Cantina 15" Single Bowl Undermount Square Hand Hammered Copper Bar and Prep Sink With Finish: Polished Nickel. The sink is artisan hand-crafted out of recycled materials with an undermount installation creates a clean, integrated look. The overall dimensions are 15″ x 15″ x 7.5″ and the internal dimensions are 13″ x 13″ x 7″ with a standard 3.5″ drain opening. Due to their handcrafted nature, no two products will be exactly the same and may vary in finish, texture and other details. Product CPS834. Includes drain for Polished Nickel finish.