The s are a great way to add and improve visibility 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 39â, 37.5â, 35.5â, and 33.5â (as measured from the top mounting bolt hole center to the top of the PVC cap) •1-1/4" pre-galvanized steel tubing•1-14/16" outer diameter white PVC tube•Works with CE Smith 2' Bunk Board Guide-Ons and the CE Smith 5' Bunk Board Guide-Ons•Can be used with other bunk board guides with 1-1/2" tubing•Includes all needed hardware to mount with existing CE Smith Bunk Board Guide-Ons•Sold in pairs•Bunk board guide-ons sold separately•Pre-galvanized steel construction Mounting hardware included for easy install Adjustable height for custom fit | C.E. Smith Extended Post Guide-On in White