Designed for use in calm water applications this unique marine aluminum anchoring option is designed to allow docks to adjust to changing water levels. Installation requires marine aluminum i beam which is secured to bulkheads, fixed docks or pilings on which the slide rail travels as water levels change. Kit includes two connection points, additional are available upon request. Standard kit of two connection points with 10' i-beams is $780, cost may vary depending on custom installation requirements of customer.