Many pocketknives also have other doodads on them too, such as: tiny screw drivers, a tool to gut fish, a small magnifying glass, a toothpick, tweezers, andscissors. Some more elaborate and expensive versions feature even more little (and often useless) tools, all that fold into the knife and fit neatly back in your pocket. One of the most well known pocketknives are the Swiss Army type; although they're also among the most expensive (some go upwards of $100 USD).