Boat Hook Mooring Cover Support Crown Constructed of UV resistant injection molded nylon this crown fits the tip of an adjustable boat hook, or any universal threaded device, to support a mooring cover or canvas top. The unique configuration has strap or line attachment details designed to secure the support crown in the correct location eliminating problems caused by water pooling from rain, sleet or snow. Combine any Sea-Dog; Boat Hook with the Support Crown 491110-1 and mooring cover support crown straps 491115-1 for the perfect solution to nature's pooling pressures.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.