C.E. Smith Pontoon Roller Guide-On - Ideal for bunk style pontoon boat trailer with box, channel, or I-beam frames up to 3in wide x 4-1/4in tall. Minimum friction rolling action easily guide pontoon boat onto trailer. Height is 25in above trailer frame. Mount with roller bunks 2-3in from pontoons on a trailer fram cross member. Features: Fits frames up to 3in wide x 4-1/4in tall U-bolt mounting brackets Includes two rubber roller bunks Galvanized steel construction Zinc plated hardware