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“Three In One” is an innovative self-adjusting wrench. It has a simple shape as a single open-end wrench, while it has various functions as adjustable wrenches. Owing to its unique structure of stackable jaws inside the wrench opening, ”Three In One” can match three different sizes of screw nuts.
when user embeds the screw nut in the wrench opening, the smaller jaws will be moved inward and the screw nut will be matched with the exact jaw of the same size.