The Tile Redi RND1614S-20 Double Niche Set containing (1) RN1614S-BI 16" W x 14" H x 4" D Single Niche and (1) RN1620S-BI 16" W x 20" H x 4" D Single Niche makes manually constructed shampoo and soap niches a thing of the past. Tile Redi recessed shower shelves provide the perfect spot for your soap, shampoo, conditioner, razor, shaving cream, body scrub, body wash, and other personal care items, while also eliminating the need for bulky shower racks and soap dishes that take up space in your shower or bath. The Redi Niches can be installed in a shower, spa, steam room, by a bath tub, on a bathroom wall, or any place else where you desire a waterproof, attractive shelf space that can be tiled. Tile Redi shower shelves are water proof, leak proof, and mold and mildew resistant - and are designed to be recessed into your shower wall for a streamlined, clutter free look. From there, the marble, stone, porcelain, glass mosaic, or ceramic tile of your choice can be installed directly to the surface of the shower niches with a premium modified thinset mortar or an epoxy adhesive such as Redi Poxy. No additional waterproofing is necessary! Overall dimensions: 16" W x 34" H x 4" D with shelf 20" H.• Please note: This double niche set contains (1) RN1614S-BI 16" W x 14" H x 4" D Single Niche and (1) RN1620S-BI 16" W x 20" H x 4" D Single Niche that are shipped in separate boxes. The product image depicts what the entire double niche set would look like if installed together, vertically. If used in the vertical design that is shown, a double niche is created which can then be tiled for a seamless look.• Features:- Contains (1) 16x14 Single Niche and (1) 16x20 Single Niche shipped in separate boxes- Dimensions (if installed as shown): 16" W x 34" H x 4" D with shelf 20" H- Height can be lengthened to allow for your personal preference and/or tiling needs- Easy-to-install and Ready-to-Tile, tile set directly on niche surface- Water-proof, leak-proof, and mildew-free