Ring spanners, also known as box-end wrenches, are hand tools used for turning nuts and bolts. They have a closed loop or "ring" at one or both ends, providing a snug fit around the fastener. This design helps prevent rounding off the corners of nuts and bolts, as the contact area is greater compared to an open-ended wrench.
Ring spanners are typically available in sets, with each wrench having a different size at each end. One end might have a larger ring for bigger fasteners, while the other end has a smaller ring for smaller fasteners. This dual-end design makes them versatile for various applications.
There are different types of ring spanners, including:
Single-ended ring spanners: These have a ring at only one end, and the other end is usually an open jaw or may have a different type of wrenching feature.