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This 10-in-1 utility tool is a great gift for boaters. Its functions include a square drain plug wrench, survival whistle, gas cap key, flip-top gas cap crank, flat-top drain plug tool, canvas snap opener, a fishing line cutter, deck plate tool, and more. It also works as a bottle opener and wine corkscrew.
Original source: https://theawesomer.com/boat-gadget/651372/