The Cascata hidden shower bench bracket is designed to hold a solid surface bench of granite, quartz or concrete board and tile. The Cascata bench support has 16" long sides with a short 1.5" down leg that will have the bench appear as if floating out of the wall. Use shims during installation for out of square walls. The Cascata shower bench support can be installed pre-tile or tiled after using proper tools and waterproofing practices.