Prevent sagging and water pooling with the Boat Cover Support Slat Sockets - 2 Pack. The angled, precision-engineered design accommodates fiberglass, aluminum, and wood cover support bows for versatile, long-lasting use. The Attwood Boat Cover Support gives your investment the support it deserves. Requires two #10 fasteners (not included). Cancer and Reproductive Harm- www.P65Warnings.ca.gov.