A few models of Victorinox knife include a blade can be opened with one hand (the same hand that holds the knife). The blade then locks securely into position, with a thumb-action release. This blade features a partially serrated edge, and is 3 1/8" (80mm) in length.
Uses: To open the one hand blade, hook your thumb into the hole on the blade, and flip it open. It takes some practice to do it quickly!