This replacement boat trailer guide on pole is manufactured out of 1 1/2 inch square aluminum tubing with 1/8 inch wall thickness. It measures 46 inches tall and has a 24.5 inch long leg for easy width adjustment to fit the sides of your boat as is goes onto your trailer. It has an aluminum welded tab to serve as a stop for your Pvc Guide Post. This guide pole is designed to have 2 inch Pvc slide over top of it. The pvc sleeves are available separately. The guide poles typically attach via u-bolts to the main I-beam frame or into a cross member. This listing is just for one single Guide Pole. This does not include mounting hardware. There are many ways to mount guide poles onto your trailer. On Square Tubing, Guide Poles Will commonly need a 1 1/2 inch Galvanized Boat Trailer Hat Bracket or a similar type of bracket. These Brackets Require Specific Sized Boat Trailer U-Bolts depending upon the height and width of your trailer frame. If you are mounting your aluminum square guide pole to an I-Beam Trailer frame, or inside a cross member, you will most likely on need (2) Stainless Steel Square Ubolt 3/8 inch x1 9/16 inch x 2 1/2 inch per side. The width of this U-bolt will fit perfectly around the 1 1/2" square tubing of the aluminum guide post. the length of this U-Bolt is ideal for mounting the post directly to a trailers I-Beam Frame of inside the rear cross-member of the trailer. For this application you will need to drill holes in order to mount your guide pole in this way, unless you previously used the same arrangement. Using stainless steel U-Bolts with your Aluminum Guide Poles will make the best fit and longest lasting combination for your guide pole system. Using Aluminum Guide Poles ensures that your post will no longer rust out. Typically lesser guide ons will rust from the inside out.