Boat Hook To Lock Button Accessory Adapter Constructed of fiberglass filled injection molded nylon for strength and UV resistance this adapter allows the Sea-Dog(R) boat hook to be used with Shurhold(TM) and other accessories that have a lock button attachment system. 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.