Harbor Mate telescoping boat cover support pole is designed to prop up a boat cover during off-season storage to reduce water and debris buildup, making it much easier to remove the cover when boating season returns. Each cover pole adjusts from 28″ to 48″ high and twists to lock. Be sure to unlock the bars by twisting in opposite directions to allow telescoping and then back to secure in place. For added cover tension support, a 4.875″D mushroom shaped cap is included, which snaps directly to the cover support pole once the snap screw attachment is removed. The foot includes a rubber cap designed not to scratch the boat hull during storage. Made with Light-weight, durable aluminum construction built to last.