Bathroom Shelf. With Renovator's Supply finished brass trim, this glass shelf is supported by fine white porcelain backplates. In addition to a beautiful ribbed pattern, they have a lovely mauve floral design that will bring color to any bath. The 1/4 in. thick shelf measures overall 21 5/8 in. wide x 4 3/4 in. projection and has rounded edges. The backplates project 1 3/4 in. from the wall, making it 3 1/2 in. high when mounted.