Wrenches are hand tools used to tighten items with screws or nuts. They have a special material and design to offer greater security and isolation. Insulated and safety tools are used in jobs where the operator is exposed to electrical equipment and circuits. They are essential to guarantee maximum protection. Machines and tools are instruments that are intended to perform a mechanical task by applying some type of force to them or by using some type of energy source. There is a wide variety, such as cutting, clamping, striking, joining, mounting or measuring tools.