C.E. Smith Boat Trailer Extended Post Guide-On - Guide-Ons are a great way to add and improve visiblity when loading and unloading your boat. The Extended Post Guide-Ons pair nicely with CE Smith Bunk Board Guide-Ons, coupling the centering support and the added visuals to make trailering easy. 4 Adjustable height settings 39.5 in, 37.5 in, 35.5 in, and 33.5 in (as measured from the top mounting bolt hole center to the top of the PVC cap) 1-1/4in pre-galvanized steel tubing 1-14/16in outer diameter white PVC tube Works with CE Smith 2ft Bunk Board Guide-Ons and the CE Smith 5ft Bunk Board Guide-Ons Can be used with other bunk board guides with 1-1/2in tubing Includes all needed hardware to mount with existing CE Smith Bunk Board Guide-Ons Sold in pairs Bunk board guide-ons sold separately