This boat trailer upright guide on kit comes with two Upright guides, manufactured out of 1 1/2" square Aluminum tubing. The upright guides measure 46 inches tall with the leg measuring 24 1/2 inches long for easy width adjustment to fit the sides of your boat as is goes onto your trailer. This 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. On I-Beam frames these Guide Poles can mount with Stainless Steel Square Ubolt 3/8 inch x1 9/16 inch x 2 1/12 inch and holes can be drilled into the i beam for easy installation. For square tubing frames, 1 1/2 inch Galvanized Boat Trailer Hat Bracket can be used with the appropriate sized 3/8 inch U-Bolt. The Overall Height of the Guide Pole Kit once PVC is installed will be roughly 60 inches. These Guide Poles are bent at 90 Degrees for perfect alignment with the sides of your boat.