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The SOG Twitch II is made with all the quality workings that you find in a fine chronograph watch. Everything is precise and performs flawlessly. This spring assist knife features a pass through lockbar--when you press on the "kick" or spine flipper the blade starts to open and the . S.A.T. (SOG Assisted Technology) then takes over to finish opening and to securely lock the blade open. This model, the TWI-98, features a grey hard anodized aluminum handle and a satin finish blade with partial serrations. The Twitch II is a fantastic lockback knife and is perfect for every day carry. Blade Length 2.68" x .1" Overall Length 6.2" Weight 2.6 oz. Edge Straight Steel AUS 8 HRC 57-58 Handle Hard Anodized Aluminum Finish Satin Sheath N/A Country of Origin Assembled in the USA