5/16" OEM Brake Fuel Transmission Line Coil Tube Zinc Coated / Copper Lined, 25 Ft, Standard Automotive Spec 5/16 OD, .028 Wall Thickness. This is one roll of 5/16 brake line. It is manufactured by Inline Tube. Used for all automotive applications, .028" wall thickness so that it is easy to flare, bend and install.