What tool is used for turning hex and square nuts and bolts?

The tool designed for turning hex and square nuts and bolts is a combination wrench. This tool features an open-end on one side that fits over the flats of the nut or bolt head, allowing for easy application of torque without the risk of slipping. The other side typically features a boxed end that can securely grip the nut or bolt, providing additional leverage and allowing for a tighter fit around the fastener.

Combination wrenches are particularly versatile because they can handle different sizes of nuts and bolts, making them a staple in any toolkit. They enable users to work efficiently in confined spaces where other tools may not fit. The design of the combination wrench also helps prevent damage to the corners of the fasteners, which can happen with tools that do not fit as snugly.

In contrast, while socket wrenches are also effective for turning nuts and bolts, their use is generally more specialized as they require a socket attachment that corresponds with the size of the nut or bolt being turned. Pliers can grip and turn nuts and bolts, but they are less precise and can slip, risking damage. An adjustable spanner, though versatile, is not as effective for heavy torque applications compared to a combination wrench, especially when a snug fit is required.