SAFTRON high impact polymer products are made of specially formulated compounds to ensure longevity and unparalleled resistance to the elements, UV, and chemicals while requiring virtually no maintenance. They are guaranteed to keep their smooth, bright finish for many years. A replacement Ladder Step can be mounted to any ladder that uses the standard 1.90" OD rails and 19-20" spacing between centers. Steps are ribbed to withstand heavy loads. Hardware not included.