CleverDelights aluminum stamping blanks. Raw material. Diameter: 7/8" (0.875) inch (22.2mm). Thickness: 21 gauge (.028" / 0.71mm). Perfect for stamping, etching, engraving, valve tags, and ID badges. Some edges may require some light filing for maximum smoothness and to remove any mild burring. These are raw aluminum blanks and can be further finished for an even more professional look. Check out helpful youtube videos and other online articles on working with raw aluminum blanks for more useful tips and tricks. View our full selection of aluminum tag offerings, sizes, and gauges by searching for CleverDelights stamping blanks here on Amazon.