a drop-forged. closed-eye device for adjusting cable tension.

Merriam-Webster Online Dictionary
turnbuckle (noun)
a device that usually consists of a link with screw threads at both ends, that is to bring the ends closer together, and that is used for tightening a rod or stay - turned
turnbuckle (Wikipedia)
Small turnbuckle (80 mm [3 532 in])
Turnbuckle diagram

A turnbuckle, stretching screw or bottlescrew is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eye bolts, one screwed into each end of a small metal frame, one with a left-hand thread and the other with a right-hand thread. The tension can be adjusted by rotating the frame, which causes both eye bolts to be screwed in or out simultaneously, without twisting the eye bolts or attached cables.

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