Pipe wrenches, also known as gas wrenches or gas pliers, are hand tools designed for tightening and loosening nuts, bolts, and other fasteners, especially those with tubular or pipe-like connections. These wrenches derive their name from their ability to work with pipelines and gas pipes, but they are also used in various fields, including plumbing, metalworking, construction, and machinery maintenance.

The primary features and functions of pipe wrenches include:

1. Adjustable Jaws: The jaws of pipe wrenches have a unique profile that provides a secure grip on nuts and bolts of various sizes. They typically feature adjustable jaws, allowing the user to customize the jaw opening to fit different fasteners.

2. Handle Length: The handle length can vary and impacts the torque that can be applied when turning the wrench.

3. Locking Mechanisms: Some pipe wrenches are equipped with locking mechanisms that help keep the wrench in place without the need for additional force.

4. Applications in Plumbing: Pipe wrenches are commonly used in plumbing for assembling and servicing pipelines, adjusting plumbing connections, and installing faucets.

5. Applications in Metalworking and Construction: They are also utilized in metalworking and construction for the assembly and disassembly of metal structures and connections.

Pipe wrenches are vital tools in manual work and repair tasks, ensuring reliable and safe tightening and loosening of various fasteners, especially in plumbing and construction applications.