This corner shower shelf is made from a durable Absolute Black Granite. It was made in our fabrication shop, has a polished eased edge and is 3/8" thick. The measurements (7",8",9",10" or 12") are from the point at the back to each side edge. The 8" is the most popular. The under polish option is there if you would like to have the polished look on the bottom of the shelf. For example, your shelf is above eye level and you would prefer it look the same as the shelf beneath it. All of our...