Sea-Dog Boat Hook Yarn Mop [491107-1]Boat Hook Yarn Mop Cotton fiber strands make this an effective cleaning accessory for use in areas that require more pressure. Fits all Sea Dog boat hooks and all universal threaded devices. Universal Acme Thread 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. Specifications: Type: Tools & Accessories