Cardinal SR00539 Modular Steep Step, Step Riser 3'-1 3/4" x 2' Radius Left - Understanding that each pool is unique to its landscape and customer, the Modular Step system allows for an extended entry way to fit essentially any pool width. Specifically designed with wider pool lengths in mind, the Modular Step can be installed on any side of a pool. There are virtually endless customization possibilities when including sundecks or benches.