A twitch of your finger or thumb is all that you need. The Twitch features a pass-through lock bar from which the "kick" of the blade sticks through. By pressing on the "kick", one is able to initiate the opening of the blade. SOG Assisted Opening Technology then takes over to assist the full opening and solid lock up of the knife. Blades are made of 154CM stainless steel. Includes pocket clip. Covered under SOG's lifetime warranty. Handles are made of anodized 6061-T6 aluminum. FeaturesSatin finish blade made from 154CM steelDual thumb tabs and flipper tab triggers spring assisted openingLiner lock for safe and secure useReversible pocket clip for tip-up carry