Universal Mast Boot. Made of extremely flexible UV resistant vinyl. Designed to fit a number of sizes of mast and deck collars of the same basic shape. Molded in small steps so top and bottom can be cut at the level that provides a snug fit to the mast and the deck collar. Boot may be installed on stepped mast by cutting one side and glue together with the included adhesive. - Secure the top and bottom with stainless steel hose clamps. - Fits masts with circumferences of 17-1/2" and larger with corresponding mast collars of up to 31".