The AC19 Extension Ladder Covers help prevent damage to support surfaces. Designed to snap over extension ladder rail end caps. Resists paints, stains, thinners and solvents. Can be used on all single and extension fiberglass and aluminum ladders (except 500, D500, D7136-2 and D7140-2, D1300-2 Mk13, D1800-2EQ Mk2).