Formed from copper-brazed, double-walled, steel or copper nickel alloy tubing as used in pre-made 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 3/8 in. Domestic, European, Japanese, British, and adapter brake lines. This entry-level replacement line is an excellent choice for aftermarket fluid transfer line repair and replacement. The steel lines and tubing are constructed with safety and longevity in mind. The tubing is produced by wrapping copper-coated steel around itself twice to form the tubing. This double-wall tube is what provides the strength and structural integrity to withstand the extreme pressures required, yet still remains pliable enough to be formed and bent to the shapes required to be routed beneath the vehicle. The finished tube is fused and zinc-coated to provide excellent rust and corrosion resistance as well. The Standard Steel line has been the choice of professional installers/mechanics and do-it-yourself mechanics for many years. When properly installed, the standard steel line can provide a long-lasting repair or replacement for many types of vehicles and for all types of fluid transfer systems, including braking systems. Standard Steel lines and tubing meet the following specifications: SAEJ527b, GM123M, SAEJ1290, DIN 74234