Jack knives Jack knives, also known as slipjoint knives, have one or more blades hinged from the handle. They are usually very compact, ranging from three to five inches long. They can be single- or double-ended, although in multiple blade models the single-ended blades are usually more prominent. Multi-blade knives Multi-blade knives include several blades, some of which are special-purpose tips such as can openers and scissors. Basic multi-blade knives have at least three blades, while highly specialized models can have over a hundred. They are often as compact as jack knives, although usually thicker to accommodate the extra tools.
Pen knives Pen knives are light and double-ended, with narrow bodies and a number of slim blades. The blades can be hinged on one or both ends, and sometimes include small tools like awls and corkscrews. They are primarily used for cutting small items like pen nibs, although some of the more advanced models include more add-on tools than actual knives.
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