The descriptions for this product are taken directly from Amazon so don't blame me for bad English or misspellings. The prices you see are what I am asking for each item.
Item:DANOREC Shower Niche Shelf for 12 Inch Prefab Niches,Fits 1/8" Grout Lines,Brushed 304 Stainless Steel,for New Shower Remodels Before Tile Installation(1PCS) (1pcs)
Item Description:Multi-Application Use: This niche shelves are suitable for various shower niches with an inner width of 12 inches (width before tiling), ensuring smooth and precise installation with excellent fit. They are also flexibly applicable to tiled wall scenarios in kitchens, bathrooms and other spaces, offering versatile functionality
Product Dimensions:The bathroom shower shelf measures 11-13/16 inches in length, 3-7/16 inches in width, and 3mm in thickness, perfectly matching 1/8-inch tile grout lines Note: The shelf length after tiling is approximately 11 inches
Material & Design: Crafted from 304 stainless steel, this recessed shower niche shelf provides exceptional resistance to long-term corrosion from cleaners and hard water. The hand-brushed surface is both aesthetically pleasing and easy to wipe clean
Simple Installation: Requires minimal tools and can be installed concurrently during the tiling process of the niche (not suitable for installation in finished shower niches). The installation process is efficient and convenient
Caution: Must be installed during tiling. NOT compatible with Redi Niche or Ez-Niches series niches