The Starrett Internal Extensions for 78 Series Internal Micrometers includes 3/4-2" (20-50mm) sizes, 6" extension size, and fits models 78XT/780XT/781XT-1 thru 2. Extension 6"/150mm Long for use with 78/780/782 -1 thru 2.
The Starrett Internal Extensions for 78 Series Internal Micrometers includes 3/4-2" (20-50mm) sizes, 6" extension size, and fits models 78XT/780XT/781XT-1 thru 2. Extension 6"/150mm Long for use with 78/780/782 -1 thru 2.