Catch Cover long hole sleeve are made for campers or other ice fishing trailers that don't use removable or drop down axles or have elevated skid systems. Catch Cover Hole Sleeves isolate your ice fishing shack from the environment. This helps keep the shack warmer and draft free. It also prevents holes from freezing over. They fit perfectly inside both the Catch Cover round or square holes. Light and durable, these injection molded sleeves are 18" and can be custom cut to desired length if needed.