Boat Hook Three Sided Bristle Brush - Medium Bristle These three-sided bristle brushes fit all Sea-Dog; boat hooks and all universal threaded devices. The medium bristle is a good overall brush for textured and non-skid surfaces. 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.