Bottle screws are also commonly referred to as turnbuckles or rigging screws. This type of hardware is used in a variety of applications, including marine rigging, construction, and industrial settings. Turnbuckles are typically made from metal and feature a threaded rod with two end fittings that can be screwed in or out to adjust the tension or length of a cable or chain. Other common names for bottle screws include stretchers, tensioners, and adjusters. These versatile pieces of hardware are essential for maintaining stability and safety in various projects and industries, making them a popular choice for professionals and DIY enthusiasts alike.