Hello, and thank you for your inquiry. This is a custom, concrete system that went into a concrete pool. The process was as follows: Steel rebar was left stubbed up from the pool floor after the application of the Gunite (pneumatically-applied concrete). Then, sonotubes were placed around the bars and concrete was poured for the footings. Then, the footings were finished with an exposed aggregate finish exactly as the pool walls and floor. Tile was applied, and the granite seats and bar were pinned in place with 1/4" stainless steel pins and epoxy. I have attached a construction picture to illustrate.