To order your floating corner shelves please do the following. All shelves are 2" thick. 1. Measure the length from the corner on the left wall 2. Measure the length from the corner on the right wall 3. Add these two lengths together. This will be the total size you will need to select from our listing. If the size of the two lengths added together falls between our listed size options, select the next size up from our listing. 4. Select the depth you would like the shelves (4", 6", 8", 10"...