Turnbuckle

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A turnbuckle is a device for adjusting the tension of ropes, cables, and tie rods. It normally consists of two threaded eyelets, one screwed into each end of a small metal loop, one with a left-hand thread and the other with a right-hand thread. The tension can be adjusted by rotating the loop, which causes both eyelets to be screwed in (or out). Turnbuckles are most commonly used in applications which require a great deal of tension; they can range in mass from about ten grams for thin cable used in a garden fence, to thousands of kilograms for structural elements in buildings and suspension bridges. This device is also known as a bottlescrew and is used on ships for tensioning rigging and lashings