78/782H Extensions for 781XT AccuBore Electronic Bore Gage 65486

The Starrett Internal Extensions for 78 Series Internal Micrometers includes 1/2-3/4" (12.5-20mm) sizes, 4" extension size, and fits modeles 78XT/780XT/781XT625-750. Extension 4"/100mm Long for use with 78/780/782, 500-750.

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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.)
  • 4" Length


  • Fits Starrett Series: 78XT/780XT/781XT/782XT–625-750