This boat trailer upright guide on kit comes with two Upright guides, manufactured out of 1 ½” square hot dipped galvanized steel tubing. The upright guides measure 41” tall with the leg measuring 31” long. The length of the leg allows for easy adjustments to fit your boat properly. Kit also includes two PVC Sch. 40 poles and caps.  The upright guides are designed to have the 2” PVC pole slide over top of it and rest on the tab already installed on the guide for the correct placement.  The guides will typically attach into a cross member or by using u-bolts to attach to an I-beam frame.