KIT – 5/16 Poly-Armour Coil with 5/16 Tube Nuts. AGS is the industry leader in the automotive aftermarket for steel brake, fuel, and transmission lines. When combined with tube nuts and flaring tool, coils are an economical solution for shops that want to build their own lines, custom lengths, or non-standard applications. Use to fabricate 5/16 inch Domestic, European, Japanese, British, and adapter brake lines. The PVF or Poly-Vinyl Fluorine coating is actually a highly durable ‘plastic’ coating that is ‘baked and cured’ to the line. This provides extra protection from corrosion, debris, and road surfacing solutions. It also offers superior bend-ability without kinking. Underneath the PVF-coating is a double-wall, low carbon steel, copper brazed tubing which meets all international and U.S. requirements for brake tubing. The difference being that Poly-Armour offers 30 times the corrosion resistance of galvanized steel alone. PVF-coated lines are now the standard in many vehicles on the road today including: Volkswagen/Audi, Honda, Toyota, and Mercedes. Considered a premium line, Poly-Armour should be used on any vehicle that will see any type of harsh environment including snow, road treatments, salt, air, dirt/gravel, etc. When extending the life of the lines is important, Poly-Armour should be used; such as on commercial vehicles or when exact OEM replacement is required or desired. – DOT Approved for Hydraulic Brake Systems – Bends Easier than Standard Steel Tubing – Available in Coils of 25′ and 50′ – Finished Lines Available for Domestic & Import. Poly-Armour lines and tubing meet the following specifications: SAEJ527b, GM123M, SAEJ1290, DIN 74234.