3" welded outside aluminium donut is a hollow circular-shaped metal piece used for making tight custom bends. It features a 3-inch outside diameter, a 2mm thick wall, and two pre-welded halves joined solely along the outer perimeter. Fabricators cut sections from it to create custom angles for vehicle piping- Diameter: 3 inches (76 mm outside diameter) - Wall Thickness: 2.03mm - Radius: .075:1 - Material: AL1061