A set of metric wrenches, open at one end, box/ring at the other (see magnified version)). This type is commonly known as a “combination” wrench

A wrench (or spanner) is a tool used to provide grip and turn nuts and bolts, and similarly shaped objects.

In British English, spanner is the standard term. The most common shapes are called open-ended spanner and ring spanner. The term wrench is generally used for tools that turn non-fastening devices (e.g. tap wrench and pipe wrench), or may be used for a monkey wrench – an adjustable spanner.