![AN Double Headed Wrench - 06 AN B-nut - 04 AN S-nut AN Double Headed Wrench - 06 AN B-nut - 04 AN S-nut](https://cdn11.bigcommerce.com/s-wcsah6s104/images/stencil/300x300/products/9290/39951/Double-Sided-Wrench__42080.1732894746.jpg?c=1)
Finish Line Factory’s Double-Headed wrenches represent an upgrade over our standard wrenches. Each wrench is sized to fit either the B-nut or the S-nut of each hose end. The B-nut is the part of the hose end that fastens the hose, the S-nut is the part of the hose end that fastens the fitting to the male flare.