Product details:
Designed for I-beam trailers and I-beam boat lifts, these guide-ons feature a two-piece mounting clamp that works above or below the I-beam. Fits on I-beams up to 4" wide with provided hardware. Sturdy 1 1/2" galvanized tube upright extends over 40" into the non-marring, heavy-duty 2" PVC tube. Provides up to 19" of lateral adjustment out from trailer frame.