If you spend time on a boat, you know the frustration of needing a shackle key or deck cap wrench right when your hands are full. This dual-ended tool packs two universal deck keys, a shackle key, and a quarter-inch hex driver on one end, plus a zipper puller and bottle opener on the other. It saves you from digging through a damp tackle box just to uncap the fuel tank or crack open a cold drink.