Product Info Catalog Hardware Metal Stock Sheet Stock Plain Aluminum Sheet, Mill Finish, 24 x 36-In., .020 Thick Plain Aluminum Sheet, Mill Finish, 24 x 36-In., .020 Thick Request a Quote UPC: 40395201255 SKU: 213207 Model Number: 11488 24" x 36", .020 Thickness Mil Finish, Plain Aluminum Sheet.