Highlight description: [Welding PVC Structure] 4 pieces of D-ring patch, light weight, sturdiness, durability and corrosion resistance. The patch has a diameter of 3.15 inches (8 cm), and the inner width of the D-ring is 1.2 inches (3 cm). 304/316 stainless steel material, strong corrosion resistance, not easy to rust, durable. [No Glue] You need to buy special glue, as long as you follow the complete glue process, because it will melt with the material to some extent, so the adhesion is very strong. Detailed description: Material: Stainless Steel + PVC Color: Black, White (Optional) Size: Patch Diameter 3.15 inches (8 cm) D Buckle Width 1.2 inches (3 cm) D Type Buckle Thickness 4mm D-type Buckle Surface Treatment: polishing treatment Note: Due to manual measurement, there will be an error of 1-3 cm. Parts List: 4x D-ring Patches These patches are sturdy, delicate, compact, easy to use, and can be made according to your needs The solid design increases the bearing capacity, the structure is stable, the shock resistance is good, and it is strong and durable Process polishing restores the true color of stainless steel and improves the corrosion resistance of stainless steel Just apply super glue on the bottom of the patch and stick it on the boat. Secure items with rope Suitable for PVC inflatable boats, rafts, dinghies, kayaks, canoes, surfboards, upright paddle boards, etc. Used for rescue ropes, cargo, thigh straps, etc