This flexible system conforms to virtually any rail or pulpit system. What do you want from your fender holders? Most boaters would agree that versatility, durability and style are the key. Polyforms True Fit Fender Holder system is the answer. Ours is a modular system that will fit rail systems from 7/8 to 1 (1-1/4 rail adaptors; TFR-404, are available separately) at any height or any angle. Because its modular you can mix or match sizes or add on as your needs change. Choose Polyform fender holders, and youve selected one of the most popular fender holders on the market.