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 are easily mounted on top of rear cross member of the trailer frame. No drilling required. Metal arms are made of 1-1/2" 16-gauge pre-galvanized steel tubing and extend fully into sturdy 2-3/8" PVC posts for strength and durability. Pontoon Post Guide-Ons fit up to 3" x 4-1/4" frames. 22" high. Made in USA. Sold in pairs. Metal arms made of 1-1/2" pre-galvanized steel Fit up to 3" x 4-1/4" frames 22" high | Pontoon Boat 22" Post Guide-Ons, pair Made in USA