As a part of the KOHLER® Purist collection, this shower base captures the language, feeling, and art of water with its simple design lines. This rectangular 48" x 36" KOHLER Enameled Cast Iron base features a single threshold. Safeguard® slip-resistant surface is included for added safety and convenience. Kohler® Shower Receptor, Single Threshold, Purist®, 48 in Length, 36 in Width, 5-1/8 in D, Center Drain Location, 3-3/8 in Diameter Drain Hole, 20 psf Minimum Floor Load, Cast Iron, White