... on vehicle brake system 3.profassional manufacture bundy tube brake line used for brake systemDouble wall or Single wall copper plated,green ... 5mm 1/8"HL 3.2mm X 12.5mm 1/8"HL 4.8mm X 12.5mm 3/16"HL2>Air brake ... 76mm,6mm,8mm,10mm with single wall or double wall for various coating: copper,polish,white zinc,pvf,olive green, ... together with you in the future.!!! bundy tube brake line used for brake system