Ready-4-tiles shower base  36''x 40''Can be installed in a corner or alcove. Square drain and strainer included.Corner real dimension: 29,5/8'' x 37,5/8''  alcove real dimension:29 5/8''x 40''Grate dimensions: 12''x 12''-Installation and tiling on the same day- build-in slopes-100% waterproof-No-leak guarantee-No need for extra waterproofing product during installation-No deterioration, no mildew caused by water infiltration