The SOG Twitch I is the original Twitch knife by SOG. This spring assisted knife is a wonder to hold and use. Smooth action, thin profile, and heavy duty materials all combine to make this a great knife to carry in your suit pocket our in your jeans. 2 3/4" closed. Features S.A.T. (SOG Assisted Technology). The blade is propelled open once the operator has initiated the one handed opening action. AUS-8 stainless blade with thumb stud. Twitch features a pass-through lockbar from which the kick of the blade sticks through. 6061-T6 machined aluminum handles with anodized graphite color. Designed by Spencer Frazer