Before revision: Production Steel remains the most commonly used slotted angle material, although aluminium alternatives are also available.Aluminum Angle Iron Making Process - URL (accessed: 22 july 2017) |date=March 1, 2012 }} The product is generally manufactured from sheet metal using machine presses to form the angle and to punch holes through the metal.
After revision: Production Steel remains the most commonly used slotted angle material, although aluminium alternatives are also available.Aluminum Angle Iron Making Process - URL (accessed: 22 july 2017) }} The product is generally manufactured from sheet metal using machine presses to form the angle and to punch holes through the metal.