Designed for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. Consisting of two threaded eye bolts, one with a left-hand thread and the other with a right-hand thread. Adjust tension by turning the body of the turnbuckle left or right. Ideal for use with attaching shade sail cables to D-shackles, providing tension in a fence or perimeter cable, and many other indoor/outdoor applications. The eye & eye turnbuckles are generally used with more permanent fixings. Open body, alloy construction giving strength and great weather resistance. 8mm (5/16â€). Loose.