Anti-Corrosion And Anti-Rust: D Ring Tie Down Anchor Is Treated With Galvanization To Prevent Corrosion And Rustingeasy Installation: Fasten To Any Wood Or Metal Surface By Passing Screws Or Bolts Through The 1/4 Diameter Bolts And Basic Hardware On Any Surface Or Floormulti-Purpose: Once These D Rings Are Mounted, You Can Use Them As Tiedown Anchors For Motorcycle Straps, Bungee Cords, Tarp Straps, Small Chains, Ratchet And Cam Straps, Ropes, And Other Tie-Downsthe Lashing Rings Is Multipurpose,Designed To Be Surface Mounted And Add A Convenient Anchor Point For Cargo Straps,Ropes Or Cables, Bungee Cordswhen Not In Use, The Large Flap D-Ring Anchor Points Will Fold Up, Which Is Versatile Enough To Accommodate Most Cable Tie Down End Accessories