All of our Round Tube Inserts are made from a durable LDPE Plastic to ensure a long-lasting solution. They are an ideal product for insertion in to tubes, pipes, and other cylindrical objects. They come designed with ribs, which allow them to fit tightly into almost anything. These larger sizes of inserts are most commonly used inside industries that deal with things such as sign-posts and fences. Doubling up as an end cap, these inserts can easily round off and finish a post. They are used to prevent the ingress of excess moisture, dirt, and dust that can build up and cause damage over time.