Spyderco's Compression lock is the ever-popular mechanism found on a majority of the USA produced models. The Para Military, Para 3, newest Military, and others are amongst the best-selling models with this locking mechanism. The compression lock uses a leaf-like spring from a split liner in the handle to wedge laterally between a ramp on the blade tang and the stop pin (or anvil pin). Developed by Spyderco, it provides extreme lock strength and ease of use.