Manual wrench

A bolt or nut wrench is a handheld tool used to tighten or loosen bolts and nuts. Common types include open-end wrenches, box wrenches, socket wrenches, adjustable wrenches, and Allen wrenches, to accommodate fasteners of different sizes and shapes. They are characterized by their simple structure, durability, and portability, making them indispensable basic tools for mechanical repair, equipment installation, and everyday household work.