What is a regular socket used for?

A regular socket is specifically designed for turning nuts and bolts, making it an essential tool for tasks involving fastening and loosening various types of fasteners. The socket fits over the head of the nut or bolt, allowing a wrench or ratchet to be used effectively to apply torque. This capability simplifies the process of assembling or disassembling mechanical components in various applications, from automotive repairs to construction projects.

The other options refer to tools that serve different functions; for example, drilling holes involves a drill or bit, sawing limbs requires a saw, and smoothing surfaces is typically done with sanders or planes. Each of those tasks is distinct and does not utilize a socket. Thus, the primary role of a regular socket is clear in its unique application for turning nuts and bolts.