1Fitment: These T slot nuts are perfectly compatible with bed rails in both for Tundra, for Tacoma, but also work with a variety of other pickup trucks with compatible bed rails. 2Rings: The tie down anchors rings has a square shape provides more uniform force, the black coating is oxidation proof, anti deformation, and the thickened material can ensure the long term use. 3Practical: The tie down anchors are heavy duty made, used for securing ratchet rope, cam buckle straps, bungees cords, and the T slot has a 3/8in?16 fully tapped and threaded hole. 4Premium Material: The rails cleat T slot nuts set is made of high strength metal material, which is not easy to deform, will not broken, resistant to strong pressure, providing a strong tensile force. 5Application: The rail cleat nut set is ideal to add tie down points for a truck, trailer ,Suv, boat to carry heavy loads, and let you far away from cargo swing and noise.