Opella 18085.046 10" Round Drop In or Undermount Bar Sink - Brushed Stainless 10" Round Drop In or Undermount Bar Sink - Brushed Stainless Diameter: 10 (outside) and 8" (inside). 5" deep 18/8.5 Stainless Steel. Undermount or Drop-In. Drain opening: 1 1/2".