What type of wrench features closed jaws and often has an open-end on one side?

A box wrench is specifically designed with closed jaws that fit over and around the head of a nut or bolt. The closed end of the wrench provides a secure grip, minimizing the risk of rounding off the corners of the fastener, which can occur with open wrenches. Many box wrenches also feature an open-end on one side, allowing versatility in working with different types of fasteners in various tight spaces. This combination of a closed end for secure engagement and an open end for quick adjustments makes the box wrench a valuable tool in automotive and general mechanical applications.

Socket wrenches, while also valuable, do not have the same open-end feature and instead rely on interchangeable sockets for different sizes. Open-end wrenches feature only a single open jaw, limiting their applications for certain fasteners. Torque wrenches are specialized tools designed to apply a specific torque to fasteners, which differs from the general utility of box wrenches.