Zenith eye and eye turnbuckle is designed for tensioning cables, ropes and chains. 10mm  accessories are recommended for larger shade sails, especially over 35 square metres. It is galvanised to ensure rust resistance and extended outdoor use. One end of the Turnbuckle is threaded left-hand and the other threaded right-hand allowing the tension to be adjusted by rotating the frame.  This permits both the Terminals to be screwed in or out simultaneously without twisting the attached wire rope or fittings.