Turnbuckle - An open/adjustable metal frame used in combination with a threaded fastener, commonly with eye bolts, for support and adjustability in construction and industrial projects. The right-hand thread and opposing left-hand thread allow for the threaded components to be installed, removed or adjusted without “twisting” the attached cable(s). Commonly used in construction projects such as awnings(restaurants & building entrances), bridges, and telephone poles. Also, you may see them used for the boxing rings and entertainment events: stands, displays, etc.