Also known as a stretching or bottle screw, a turnbuckle is a connecting device designed to be tightened after it's attached. It often features a loop at one end and a hook at the other and can adjust the length of the rope, cords, or other materials to which it connects. This allows for some flexibility to get suspension items like hammocks positioned right where you want.
The design features two screws mounted in a metal frame, which can be rotated to create a longer or shorter apparatus. This can be useful for tightening construction elements that are otherwise difficult to draw together, and for supporting significant amounts of tension. This makes them useful at many scales, from home scale to industrial engineering.
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