Arconic has combined two proven and tested innovations in the Dura-Bright/Dura-Flange surface treatment. The new finish offers added protection against rim flange wear with easy care surface. The result is a wheel that maintains its premium, high-shine appearance while, like all Alcoa Wheels, allowing fleets to increase payload and reduce fuel and maintenance costs.
This so called DD finish is available on following Alcoa Wheels sizes:
19.5 x 7.50: part number 773453DD (bolt hole Ø 32 mm)
19.5 x 8.25: part number 783453DD (bolt hole Ø 32 mm)
22.5 x 7.50: part numbers 874523DD, 874513DD
22.5 x 8.25: part numbers 882523DD, 882513DD