Domestic Steel Brake Line, 1/4 x 51, BL-451 The Entry-Level Replacement Line In The AGS Brake Line Category Is Still An Excellent Choice For Aftermarket Fluid Transfer Line Repair And Replacement. This Double-Wall Tube Is What Provides The Strength And Structural Integrity To Withstand The Extreme Pressures Required, Yet Still Remain Pliable Enough To Be Formed And Bent To The Shapes Required To Be Routed Beneath The Vehicle. However, When A Vehicle Is Expected To See Harsh Environments Like Snow, Road Treatments, Salt Air, Etc.- Excellent Resistance To Rust And Corrosion - Dot Approved For Hydraulic Brake Systems - Bends And Forms Without Kinking - Available In Coils Of 25' - Finished Lines Available For Domestic & Import.