Cue that The product does not contain glue Customers must bring their own Kayak Rail Set: This set includes 4 stainless steel D-rings. 5 cm in diameter. The inner diameter is 23mm high. It is a tool that rafting equipment usually uses to install various equipment on the boat. D-ring design: This product is designed in the shape of the letter D. Kayak D-rings can be used with rowing ropes to grab paddles, rods, nets and more while seated on the boat. This D-ring patch will fit most kayaks. You don't have to worry about compatibility. High Quality Material: High quality elastic and flexible latex core with polyester outer coating. The stainless steel pull ring will not rust and is durable. With high breaking strength and high UV resistance, flexible and wear resistant. Strong applicability: D-ring pads are suitable for PVC inflatable boats, rafts, inflatable boats, kayaks, canoes, SUPs, surfboards, etc. for paddles, poles and pole boats that need to be tied down. Nets and other elements The black look makes it easy to insert into your kayak.