U-J Bend Specifications ———————-Tube Diameter 2.5″ O.D. U-Bend Centerline Radius 4″ Approx. Leg Length 8″ Tube Thickness .65″ (1.65mm) Vibrant’s unique U-J Mandrel Bent Tubing combines a 18 degree bend and a 45 degree bend into one integral unit to give fabricators the ability to get up to 3 seperate bends and a substantial straight length from each piece. Ideal for building custom exhaust systems, headers, downpipes, intercooler piping, etc…. Aluminized Mild Steel is a superior grade of Mild Steel. To be classified as Aluminized Steel, cold rolled metal sheet is hot-dip coated with an aluminum-silicon alloy. This process allows the steel to be far more resistant to corrosion and heat than normal mild steel.