Zenith Bottle Screws are commonly used for tensioning wire rope in applications such as fixing balustrades or shade sails. The streamlined body gives a sleeker look than an open body turnbuckle. Jaw and swage bottle screws must be hydraulically swaged. Not suitable for hand swaging. Marine grade 316 stainless steel provides corrosive protection to perform in tough conditions including coastal environments. Suits wire 3mm in diameter.