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 a Sea-Dog Boat Hook with the Support Crown and mooring cover support crown straps (#491115-1) for the perfect solution to nature's pooling pressures.