Marine Grade 316 Stainless Steel Spring Loaded Fender Hook Can be installed in anyplace. Holds fenders, when open and is only 1/4" high when closed. Requires (3) 3/16" fasteners. Height above the surface: Open 1", Closed 1/4" Hole Size - 3/4" Fits Rope - up to 1/2" Highly polished Cap with Diameter: 1-3/4"