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Flare nut wrench sets have a 6-pt. design that allows more contact with the fastener's sides than the 12-pt. style and prevents rounding the fastener's corners. These double end SAE (inch) wrenches have a different size on each end so that each wrench can be used for two different size fasteners. Wrenches have a standard, fixed head and an opening in the wrench head that allows a line or other obstruction to pass through it.