PURPOSE: Add additional tie-down points to your inflatable boat or equipment with these PVC D-rings, making it easy to tie down equipment in a raft or canoe or add grab lines for more safety. DURABLE MATERIAL: 4 pieces of 4 inch inflatable boat D-ring circular patches are made of PVC, small and lightweight, sturdy and durable. With stainless steel pull ring, it is corrosion resistant, even if pulled hard, it will not break. EASY TO INSTALL: D-ring patch for inflatable boat, the operation method and Use is simple and practical, just apply super glue to the back of the patch, then stick it on the boat. then use the rope to fix the object. Application: The D-ring patch can be used for PVC inflatable boats, canoe rafts, dinghies, kayaks, surfboards, surfboards. stand up paddle, sups and many other applications, and is a great replacement accessory for them. GLUE NOT INCLUDED: Note that our D ring patch does not contain glue, you need to purchase special strong glue to stick the D-ring patch to the position you want to stick.