A few Wenger Swiss Army knives include a locking, end-mounted Phillips head screwdriver as one of the tools on the main side of the knife. It is a bit more accessible than the rear-mounted driver.
Uses: On the 85mm standard-size knives that include this tool, the Phillips screwdriver locks into two different positions. You can use it at the end of the knife (similar to a regular screwdriver), or at right angles (similar to an offset screwdriver). If you have a screw that is very difficult to turn, you can grip this screwdriver blade with an adjustable wrench or pliers to get more torque-- something that is not possible with a round blade.