Pipe wrenches are typically used on pipes with diameters ranging from:

• Minimum: Around 1/2 inch (1.27 cm)
• Maximum: Several inches, depending on the size of the wrench. Some heavy-duty pipe wrenches can handle pipes up to 6 inches (15.24 cm) or even larger.

It is important to select the correct size of pipe wrench for the diameter of the pipe being worked on to ensure a secure grip and prevent damage to the pipe or the tool.