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Adjustable wrenches are tools used to tighten or loosen bolts and nets. The pinching part width is can be adjusted by worm gear, enabling the use of multiple sizes of bolts and nuts. Adjustable wrenches with ratchet functions can tighten without releasing the bolt head. There are various models, including types where the opening can be adjusted by bite of the rack on the lower jaw in addition to worm gears and thin and light ones as well. There are also many products of different size according to the width they can handle. If the dimensions of the adjustable wrench and bolt do not match, there may be looseness due to the jaw not being secured, resulting in the bolt or nut being deformed, so care needs to be taken when using.