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Universal Ladder Tread - 17.75 Inch Rail Width state_Maine This is a PVC CombinationThis is a universal 17. 75 inch wide commercial ladder tread for all types of swimming pool ladders. It is constructed of one inch thick solid marine grade plastic for strength and durability. These pool ladder steps include a non skid surface for improved swimmer safety. They are designed to work with standard 1. 90 inch diameter pool rails. The 17. 75 inch measurement is the distance between the pool ladder rails. Be sure to measure the distance