KOHLER K-6626-6U-7 Langlade Smart Divide Undercounter Kitchen Sink, Black Black Smart Divide features a lower bowl divider that increases workspace and versatility. Constructed of KOHLER Cast Iron. Interior dimensions: 15 In. L x 18-3/8 In. W (left basin), 15 In. L x 18-3/8 In. W (right basin) Basin depth: 9 In. Undercounter installation.