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Flare Nut Spanners, also known as flare nut wrenches, brake spanners, and flare spanners, are open-ended spanners used in tightening or loosening fasteners. They are extremely helpful in areas that are inaccessible to ring spanners. Most common brake spanners are available to fit hexagonal fasteners as well as 12-point profiles. Additionally, flare nut spanners are often made from chrome vanadium steel and are available in different sizes and sets.