C.E. Smith Pontoon Square Adjustable Rail Clamp-On Rod Holder - All the same great features as the stainless adustable clamp-on (55105A) with a clamp made to for the square rails found on pontoon boats. Each rod holder comes with 2 protective liners, one to fit 1in and one to fit 1-1/4in square rail. The liners are round on the outside allowing the rod holder to be adjusted to any angle above the water, and the hidden left or right adjustment allows even more adjustment choices. Features: Our clamp fits 1in to 1-1/4in square rail; Made from 304 stainless steel tube lined with a UV resistant black PVC and fitted with a chrome zinc alloy adjustable clamp; Angle around the rail is infinitely adjustable; Angle to the left or right adjusts in 15 degree increments; Plastic insulator sleeves are included to help provide snug fit on the rail; 9in tall tube with 1-5/8in ID; Includes 304 stainless mounting screws and the hex key needed to make the angle adjustment and to tighten the clamp in place.; Gimbal pin keeps your rod from spinning; Solid bottom with drain holes prevents water from pooling; A great option for freshwater use!