This nut is used with the “lug connector” to fit on the corner tabs of the dock’s perimeter or within a “drive on” structure. We always use eco friendly high density materials, our products are tested in a laboratory for various circumstitions that may occur over time. Tested and approved for heavy duty purposes, all our product’s durability is guaranteed for life. Our customer care representatives will make sure that your shipping contains all materials and tools to set up your new T Dock installation.