Aluminum tight radius donuts are used to gain a tighter radius bend than our mandrel-bent tube. Primarily used for tight/compact installations, these donuts have a thick 2mm (14 Gauge) wall and are. They are suitable for welding, polishing, or coating.They are suitable for welding, polishing, or coating. Perfect for that custom Intercooler or Exhaust system that requires tight bends and corners. The donut can be cut at any degree of bend needed. The donut is often used in conjunction with regular U-bends and any other mandrel piping. Because the radius of the donut is so tight, both wall thickness and durability are more consistent. *Inner seam will require finish weld after cutting 2mm = 14 Gauge 0.747"