Attwood Marine - Grapnel Anchor System - 3.5lb - 11969-4. This 3.5lb anchor will hold your PWC, canoe, dinghy, kayak, or float tube in sand, mud, gravel, and rock. Includes 25' of rope, marker buoy, giant snap hook, anchor and a durable nylon storage case that protects your boat from scratches.. Features:. Weight - 3.5 lbs. 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.