The Lura 18ft Roller Screed Tube LE18ST uses a patented Aluminum Threaded Axle System that enhances the versatility of the Lightning Strike by accommodating to any size or type of pour. Sections can be combined to create the ideal length and a variety of attachments can be easily added for further customize the unit. These construction-grade aluminum tubes offer rugged durable design yet an ideal weight-per-foot ratio. When filled with water the tubes become the ideal compressive weight to achieve optimal compaction for pervious pours.