This Starrett 671 Attachment and 25-341 Jeweled Dial Indicator and 279 Radius Gage is a top-of-the-line tool for metalworking inspection and measurement. Made in the United States, it features a universal attachment indicator type and a stem diameter of. 25-341 Starrett indicator is a jeweled dial indicator. Great Starrett box for storage. Comes with lug back for mounting. Uses the Starrett 671 attachment. This is a must-have tool for any metalworking enthusiast or professional.