Pack & Size-- Package included 6pcs D Ring Patches. PVC patch diameter 4.33" (11cm), Width inside D-Ring 1.2" (3cm). Kindly note that delivery comes without glue. Welded PVC Construction-- Built super tough with multiple layers of PVC-coated material securing the stainless steel D-ring. This material is then welded to a PVC patch to create a seamless unit; stainless steel D-ring for long term corrosion-resistant service. Highlights-- Add extra tiedown points to your inflatable SUP board or other PVC-coated boat or gear with these reinforced PVC D-Ring patches, making it easier to tie gear in a raft or canoe or to add grab lines for safety. Features-- These patches are strong, easy to apply, and are commonly used by whitewater rafting outfitters to attach a variety of gear to their boats. Wide Applications-- Suitable for PVC inflatable boat, Raft, Dinghy, Kayak, Canoe, Surfboard, Stand Up Paddle Board, etc.; Used for rescue rope, bailer, cargo, thigh straps. Instructions for Installing D-rings 1. Inflate your boat and thoroughly clean the area where you need to install D-rings. You may use a mild detergent to clean the area. Make sure to completely dry the area after you clean it. 2. Position the D-ring patch on this area and using a ballpoint pen trace the outline of the patch on the boat. Angle the pen inward a bit so that the patch covers the trace mark later. 3. Apply a thin layer of glue on the D-ring patch and the on boat with in the trace mark. Make sure that the glue is evenly spread on both the surfaces, no air bubbles. 4. Allow the glue to become tacky for about 10 minutes. 5. Put some heavy object of about 5-7 lbs. weight on the patch and allow it to dry for about 10-12 hours.