Brake Line Flaring Tool Kit, 3/16″, 1/4″, 5/16″, 3/8″ and 1/2 Double & Single Tubing Flare Tool for Copper and Aluminum Fuel Line Tube. VARIOUS APPLICATIONS – TUBPRO double flaring tool set is designed to create 45-degree double or single flares in copper, aluminum, magnesium, soft steel brake lines and brass tubing (NOT APPLICABLE WITH HARD MATERIAL LIKE STEEL, IRON.).