Snap-on's RXFS1214A is a 3/8-7/16" SAE Flank Drive Double Flare Nut Wrench with a 6-point drive type. Made in the United States, this single item wrench is designed for line and flare nut applications. The wrench features Snap-on's patented Flank Drive system, which provides more torque and prevents rounding of fasteners.