Extend the life of your boat cover with this Bass Pro Shops Telescopic Boat-Cover Support Pole that prevents water from pooling on the cover. Designed to telescope 28-48 to easily create a high point on your boat cover, the support pole includes a mushroom top with an optional cover snap screw and a nonskid rubber bottom to prevent the pole from moving out of place. The pole is constructed from aluminum and locks in place. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Boat Cover Accessoy.