Profile: Aluminium Trade Centre specializes in providing aluminum extrusions, sheet and related products. We supply a range of rectangular hollows which are available in mill finish. Custom colors can also be ordered by arrangement. We carry in stock two popular sizes of aluminum machine bar or rod in alloy. Other diameters can be ordered by arrangement. Aluminum alloy 2011 is the most machinable of the commonly available aluminum alloys. Machining this alloy can result in surface finishes and a smaller amount of chips breaking from the rod.