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The Cam lock, or arc lock, uses a pivotal block to lock the blade in place. Considered one of the finest locks available, it is ambidextrous, extremely strong, safe, and easy to use. The Piston lock, or bolt-action lock, are very strong and easy to use. They employ a movable bar wedged between blade tang and knife handle to lock the blade. When pulled back against the spring tension, the tang is released.