There are many tools that mechanics need to do their job, and one of the most frequently-used tools is the wrench. Whether you’re working on a car engine or assembling furniture, wrenches are essential. The right wrench makes it much easier to tighten or loosen a bolt. Wrenches come in different sizes and can be used for various tasks. Here is an overview of different types of wrenches and which ones you should use for specific jobs.