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Spyderco developed the UK Penknife after the United Kingdom prohibited the carry of knives with locking blades. We began refining the classic slip-joint pocket mechanism with a notched joint and added two Spyderco features that define the modern folding knife: a pocket clip for convenient carry and our Trademark Round Hole for easy, ambidextrous one-hand opening. The UK Penknife is 100% made in the USA and is available with either a leaf-shaped or drop-point blade design. Both are flat ground from CTS BD1N stainless steel and feature opposing jimping on the thumb ramp and index-finger choil for positive control.