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 flat ground from CTS BD1N stainless steel and feature opposing jimping on the thumb ramp and index-finger choil for positive control.