Loading your pontoon boat onto your trailer is much easier with Smith Pontoon Boat Post Guide-Ons. These guide-ons fit inside the pontoons to center your boat on the trailer. Pontoon boat guide-ons mount on top of rear cross member. Metal arms are made of 1-1/2" galvanized steel tubing and extend fully into sturdy 2" PVC tubes. Pontoon Post Guide-Ons fit up to 3" x 4-1/4" frames. 22" high. Sold in pairs.