78/782J Extensions for 781XT AccuBore Electronic Bore Gage 65487

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.

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  • Extensions can be added to both the 780XT and 78XT Series, enabling internal measurements in deep hole bores. (Multiple extensions can also be used.)
  • 6" Length


  • Fits Starrett Series: 78XT/780XT/781XT/782XT–1 thru 2