Tommy Docks Regular Duty (Normal Duty) Superior Galvanized Steel Dock Pipe is made of Hi-tensile strength galvanized steel for durability and rigidity. The special galvanized coating covers the inside and out of the pipe to give it added corrosion resistance and durability. This is what gives the pipe it's remarkable strength and sturdiness over time. Hi-tensile properties of Tommy Docks post pipe enhances the rigidity & strength of your dock The actual pipe diameter is 1-1/4 in Not suggested for use in salt or brackish waters | Tommy Docks 4' Two Pack - Superior Pipe - Normal Duty