Which tool is best suited for removing a cotter pin?

The best tool for removing a cotter pin is a pair of pliers, often referred to as "needle-nose pliers" or "locking pliers," depending on the type being used. These pliers are designed with a narrow and pointed jaw, which can easily grasp the small ends of a cotter pin. When removing a cotter pin, the user can grip the pointed ends of the pin and pull them apart while also applying a gentle rotation if needed, allowing for effective removal without damaging the pin or the equipment it is securing.

Other common tools, such as wrenches, screwdrivers, or hammers, are not designed for this task. Wrenches are typically used for turning bolts, while screwdrivers are meant for driving screws. Hammers, on the other hand, are used for striking surfaces rather than precise removal of small fasteners. Thus, using pliers is the most appropriate choice for this specific task.