PERFORMANCE TOOL 3/8" X 7/16" FLARE NUT WRENCH

This is a 3/8 inch by 7/16 inch flare nut wrench from Performance Tool. It's specifically made for working on the fittings found on fuel lines and brake lines. These lines use a special nut that needs a wrench that grips more of the flats than a standard open-end wrench to avoid rounding them off.

The flare nut design means the wrench has a larger opening on one side and a smaller one on the other, with a slot down the side. This slot allows the wrench to slide over the line itself and still get a solid grip on the nut. It's a well-built tool that will help you get the job done without damaging those delicate fittings.