Aluminum sheet sizes can vary widely depending on the application and industry standards. Commonly available sizes include 1/8 inch, 1/4 inch, 3/8 inch, and 1/2 inch thicknesses, with widths ranging from 12 inches to 60 inches. Lengths can be from 4 feet to 20 feet or more. However, specific sizes can differ based on regional standards and manufacturers' offerings. It's also important to note that custom sizes can be ordered to meet specific project requirements. Always check with suppliers for the most current and detailed list of available sizes.