What tool has sockets that are permanently attached to a handle for turning small nuts and bolts?

The tool that has sockets permanently attached to a handle for turning small nuts and bolts is a nut driver. Nut drivers are specifically designed to fit over the hexagonal heads of nuts and provide the necessary leverage to turn them. The fixed sockets allow for quick and efficient engagement with the fasteners, making them particularly useful when working with a variety of small nuts and bolts.

While the other tools mentioned serve different functions, they do not fit this description. A socket wrench, for instance, uses interchangeable sockets, which do not remain attached to the handle. A torque wrench is designed for applying a specific torque to a fastener, often used in situations where accurate tension is critical, but it also doesn't have permanently attached sockets. An adjustable wrench, on the other hand, features an adjustable jaw to grip various sizes of nuts and bolts but lacks the permanent sockets integral to a nut driver. Thus, the defining characteristic of fixed sockets on a handle establishes the nut driver as the appropriate choice.