Tie Down's Bunk Board Guide Ons feature 2x4 black carpeted bunk boards, available in 24" or 60" lengths, ensuring proper boat alignment and protection during loading and unloading. With adjustable posts, you can easily mount them 5-11" on the side of the frame or position them 19" high if mounted above the frame. This flexibility allows you to customize the setup to suit your boat's specific requirements and trailer configuration. Crafted with quality materials, U-bolts and nuts are zinc plated while mounting hardware is galvanized, providing excellent corrosion protection and ensuring lasting durability even in harsh marine environments. The kit is designed to fit frames that are 2-3" wide and up to 4" high, making it a versatile choice for various boat trailers. Sold in pairs with all mounting hardware included, installation is straightforward and hassle-free.