Reinforced fabric and corrosion resistant metal make these D-Rings a permanent addition to your boat. Note: This is the size that is standard on our Explorer Kayaks, FastTracks & PaddleSki Series for seat attachment. Not for use with our Sport Kayaks (330 & 370), Motormount (SE-8 & SE-9) or Super Motormount (124 SMB) Boat Series. Includes glue.