The Pontoon Boat Trailer Roller Guide-On Kit keeps your prized rig safe while loading, unloading, and trailering. Galvanized steel construction with zinc-plated hardware and 2 rubber roller bunks ensure the Pontoon Boat Trailer Roller Guide-On Kit has the long-lasting strength and protective contours to let your pontoon rest easy on the trailer, so you can rest easy on the road or on the water.Specifications Minimum-friction rolling action. U-bolt mounting brackets. Perfectly fits frames up to 3 W x 4-1/4 H in. Ideal for a bunk-style pontoon trailer with box