Easy-to-install Modular Bunk Glide-Ons from Tie Down allow you to slide your boat on or off with less effort. These self-centering bunk glide-ons are designed with modular interlocking sections, so they can easily fit different bunkboard lengths. Ideal for painted, fiberglass, or aluminum boats. Fit standard 2" x 6" bunkboards. Includes four 1' end sections, four 3' sections, and mounting screws.