Sea-Dog heavy-duty dock cleat is made from corrosion-resistant, hot-dipped galvanized iron. Rugged construction makes the cleat ideal for docks, piers, and work boats. The large open base is designed to handle multiple dock lines and distribute heavy loads with ease. Uses 5/16" FH fasteners. 8"L x 2-1/8"H. 1-11/16" in between mounting holes.