This 5 pack of hook and eye turnbuckles is made from superior 316 marine grade stainless steel for maximum corrosion resistance and durability, making them a good choice for marine, outdoor, indoor and industrial use. The turnbuckle has an open body so that you can see how much room you have left to loosen or tighten. Designed for marine and boating use for rig tuning / rigging on sailboats. This would make a great choice to keep a clothes line cable at the tension you prefer. Closed turnbuckle is 5 5/8" long. Opens to 8 1/2" long maximum. Hook opening is 3/8". Weight limit is 220 pounds. Hole size is 3/8".