A Wrench is a hand-held tool used for turning nuts and bolts. Wrenches come in different shapes and sizes, each designed to fit a specific type or size of fastener. Here are some common types of wrenches:

1. Open-end wrenches: These have two flat jaws with a U-shaped opening on each end. They are used to turn nuts and bolts that have two flat sides. Open-end wrenches are available in both metric and imperial sizes.
2. Box-end wrenches: These have a closed-in shape on one or both ends that fits over the nut or bolt head. Box-end wrenches provide more torque than open-end wrenches and are less likely to slip off the fastener. They are also available in both metric and imperial sizes.
3. Combination wrenches: These have an open-end on one side and a box-end on the other. Combination wrenches are versatile because they can be used for both types of fasteners.
4. Adjustable wrenches: These have an adjustable jaw that can be opened and closed to fit a variety of nut and bolt sizes. They are also known as crescent wrenches or shifting spanners.
5. Socket wrenches: These are used with sockets that are attached to the end of the tool. The sockets come in different sizes and can be changed out to fit different nut and bolt sizes. Socket wrenches are available in both metric and imperial sizes.
6. Torque wrenches: These are used to tighten nuts and bolts to a specific torque setting. They are commonly used in automotive and mechanical applications to ensure that fasteners are tightened to the correct specifications.

When selecting a wrench, it’s important to choose the correct size and type for the specific application. Using the wrong size or type of wrench can damage the nut or bolt and make it difficult to remove or tighten. It’s also important to choose a wrench with a comfortable grip that allows for a good grip and control during use.