This sink tapers from top to bottom by 1/4"3 1/2" Center drain.Wall Thickness : 3/4"Non ReversibleBottom Width:25 3/4" Top Width 26" .Inner Dimensions 24 1/4" x 17 1/4" x 9 1/4"Due to the organic nature of the fireclay, material dimensions may vary by 1/8" of an inch. We recommend having the sink on location to trace and measure for countertop and cabinet cut outs. Furthermore , minor imperfections may appear. These are not defects; this is what makes each sink uniquely its own. Defective sinks will not pass our quality control inspection and would be recycled into a new sink at the factory.Can be installed via Under-Mount (countertop Over edge of sink), Top-Mount (countertop Under edge of sink), or Flush-Mount (countertop Even with sink)This sink is constructed of solid high-grade fireclay material using high pressure casting, ensuring durability, longevity, and resilience to acids, alkali's, scratches, and chipping.Certified by Uniform Plumbing Code (cUPC)