The larger 111mm (4 1/2") Swiss Army knives from Victorinox
include a hefty locking blade that is about 3 1/4" long (79 mm).
The large locking blade is thicker, longer and deeper than the large blade on the standard-sized knives. It includes a positive locking mechanism so the knife won't move, no matter which way you push it.
Uses: There are two different locking mechanisms used on the large, 111mm knives: