It uses an over-center locking mechanism similar to the Petersen Vise-Grip and its later UK counterpart the Mole Self-Grip Wrench, but with the distinct advantage of the jaws closing parallel instead of pinching at their tips. Parallel jaws distribute pressure evenly across the clamped object, reducing the likelihood of deforming it, and maximizing the surface area of the tool in contact with the work so there’s less slippage.
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