Steel brake line tubing are made from SAE J527 double wall brazed steel tubes, zinc plated (galvanized), or PVF coated for better corrosion resistance.
The tubes can be supplied in coils of 25ft (7.62 meter), or any other length according to your requirement.
Sizes are available in 3/16″ (4.76mm), 6mm, 1/4″ (6.35mm), 5/`6″, 8mm, 3/8″ (9.52mm), 10mm, 12mm, 1/2″ (12.7mm).