This boat trailer upright guide on kit comes with two Upright guides, manufactured out of 1 ½” square Aluminum tubing. The upright guides measure 46” tall with the leg measuring 24.5” long for easy width adjustment to fit the sides of your boat as is goes onto your trailer. 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.