This Starrett Tubular ID Inside Micrometer Set No. 823A is a reliable tool for measuring metals with precision. The micrometer type is an inside micrometer, with a minimum measurement of 1.5 inches and a maximum measurement of 8 inches. It is made in the United States and is equipped with a mechanical reading system. The set includes one micrometer and is not a custom bundle. It is suitable for use in metalworking inspection and measurement, CNC, metalworking, and manufacturing. Please note that this product can expose you to chemicals including lead, which is known to the state of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.