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Surefire Delta Folding Survival Knife
It's definitely one of the more expensive multi-tools we've written about, but it's also one of the most hardcore. The Surefire Delta Folding Survival Knife ($435) features a Crucible CPM S30V steel blade and titanium frame for maximum performance in hand-to-hand combat, but also includes a cutter/crimper, flathead screwdriver, a slotted wrench, a cord/harness cutter, window breaker, and reversible pocket clip for completing less, ummm, violent tasks.