Which device allows a tool to rotate in only one direction?

A ratchet is a mechanical device that allows rotation in only one direction while preventing movement in the opposite direction. It essentially consists of a gear mechanism paired with a pawl that engages with the grooves of the gear. When you turn the handle in the permitted direction, the pawl moves freely over the gear teeth, allowing for smooth rotation. However, if an attempt is made to turn it in the opposite direction, the pawl locks onto the gear, preventing any backward movement. This functionality is particularly useful in situations where it’s necessary to tighten fasteners without having to reposition the tool after each turn, making it a valuable feature in various applications, especially in construction and repairs.

In contrast, a pneumatic winch operates through air pressure, lifting or pulling loads but does not inherently restrict rotation to one direction. A pipe tap is a tool for creating threads in pipes and doesn’t control directional movement like a ratchet. A magnetic base drill is used for drilling applications, typically involving drilling into metal but likewise does not function as a unidirectional rotating device.