A spanner is a hand tool that is used to grip and tighten bolts and nuts. There are various synonyms that can be used in place of the word spanner, such as wrench, turnkey, and torque wrench. Some people also refer to spanners as pliers or socket wrenches. The type of spanner used may vary depending on the job at hand, with adjustable spanners being particularly versatile. Other common types of spanner include open-ended spanners, box spanners, and ratchet spanners. Whatever the type of spanner being used, it is an essential tool for any mechanic or DIY enthusiast, used for a range of tasks from repairing a car to assembling furniture.