A wrench is a hand tool used for gripping, turning, and tightening or loosening nuts, bolts, and other fasteners. It typically has a long handle for leverage and a specially shaped opening or adjustable jaws to fit different sizes of fasteners. Wrenches come in various types, including open-end wrenches, box-end wrenches, adjustable wrenches, socket wrenches, and torque wrenches, each designed for specific applications in mechanical, automotive, and construction work.
