The Brady 23211 B-907 round, blank brass tag is 2 inches (diameter), with a 3/16-inch hole for attaching the tag. The tag can be used with a Brady steel stamp (sold separately). The tag has an average outdoor lifespan of five to seven years, and can withstand temperatures ranging from -40 degrees to 1200 degrees F. Brady 23211 B-907 blank brass tags can be used to identify general purpose valves and reduce errors in industrial, and commercial settings.