Twenty-five years ago, Sal Glesser, Spyderco’s founder, set out to create a compact mariners’ tool with a corrosion-resistant blade and marlinespike. Armed with modern materials, his son Eric finished the job and released the Spyderco Tusk ($400). The marlinespike, a traditional nautical tool used for splitting, sewing or untangling lines, is locked in the open position by a ceramic ball bearing. The Tusk comes equipped with two shackle tools. The 2.3-inch stainless-steel blade has myriad uses, cutting everything from medical tape to anchor lines. Its titanium body is rust-resistant, and finger grooves provide exceptional leverage.