C.E. Smith Guide f/I-Beam Mounting 75". Designed for I-beam trailers and I-beam boat lifts these guide-ons feature an innovative two-piece mounting clamp that works above or below the I-beam. Fits on I-beams up to 4" wide with provided hardware. Specifications for C.E. Smith 75" Guide f/I-Beam Mounting: Manufacturer: C.E. Smith Color: Silver Features of C.E. Smith 75" Guide f/I-Beam Mounting Mounting hardware included Sold in pairs Adjusts out to 19" on each side Fits frames up to 3"W x 5-1/4" H 1-1/2" square 16 gauge pre-galvanized steel uprights 36" high 2-3/8" diameter white PVC posts Package Contents: C.E. Smith 75" Guide f/I-Beam Mounting C.E. Smith 27635: Guide f/I-Beam Mounting 75"