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From its patented pass-through lock bar design to the assisted opening technology, the SOG Twitch series is the next generation of the classic lockback design. Invented by Spencer Frazer, the Twitch is a 21st century lock back featuring modern construction and technology on the simple, but time-tested lockback folder. SOG Assisted Technology (S.A.T.) works through the balance of opposing high-tension coil springs. As you initiate the opening action, the force propelling your blade open becomes greater than the force keeping it closed. The result is a blade that springs open instantly once it is engaged, seemingly on its own.