Boat Hook Three Sided Bristle Brush - Stiff Bristle These three-sided bristle brushes fit all Sea-DogA(R) boat hooks and all universal threaded devices. Stiff bristles are effective for jobs below the waterline, teak and other tough cleaning jobs. Side bristles make it easy to clean in hard to reach places. 10-1/2" head is longer than industry standard covering a larger cleaning area. Universal/Acme ThreadWARNING: 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.