Whitehaus WHQ536-BL Farmhaus Quatro Alcove 36-Inch Reversible Fireclay Sink with Apron, Black 3 1/2" center drain Sink is finished on all four sides Drains RNW35, RNW50, or WH200 must be used Matching grid: GR3214 Sink Finished On All Four Sides 3 1/2-Inch Center Drain Decorative 2 1/2-Inch Lip on One Side with a 2-Inch Lip on The Other Matching Grid Available (WHGR3214) Inside Dimensions: 33 1/4-Inches by 17-Inches by 9-Inches