Ballpoint_pen_knife
Ballpoint pen knife
Multi-tool pocket knife with a concealed blade
A ballpoint pen knife is a multi-tool pocket knife consisting of a blade concealed inside an ordinary-looking ballpoint pen. The blade, typically 50 to 125 millimetres (2 to 5 in) long, is hidden when not in use. They first appeared as custom-made pens from various custom knife makers, and were later mass-produced by other companies.
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