A wrench includes a chamber formed in one end for receiving a pivotal casing which is used for receiving and storing a plier device, and includes the other end having a pivotal jaw biased to engage with a fixed jaw. The wrench includes a pair of plates disposed parallel to each other for forming the chamber. The casing includes a base wall and two side walls and an end wall for forming a space to receive the plier device, particularly a foldable plier device. A latch is slidably engaged in the handle portion for engaging with and for locking the casing to the handle portion.
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