Schluter-KERDI-BOARD-SN, 20″ x 12″ Shower NicheCondition:* New Stock, In OEM Packaging. As Pictured.Additional Notes:* SHELF-N Is a Rectangular Shelf Designed To Fit Into The KERDI-BOARD-SN Prefabricated Niche* Dimensions (HxW): 20″ x 12″ (508mm x 305mm)* Fully Waterproof and Vapor-Tight* Features Sealed Inside Corners For Effective WaterproofingSchluter SystemsKB12SN305508A1