A ratcheting ring spanner, also known as a ratcheting box-end wrench, is a specialized hand tool used for tightening or loosening fasteners such as nuts and bolts. It features a ring-shaped end with teeth or gears inside, allowing for ratcheting action. This means that the spanner can be moved back and forth on the fastener without needing to lift and reposition it after each turn. The ratcheting mechanism saves time and effort by enabling continuous rotation in one direction while maintaining contact with the fastener. Ratcheting ring spanners are commonly used in automotive, mechanical, and plumbing applications where accessibility is limited or repetitive motion is required.