Rotagrip Ltd   3 Point Internal Bore Micrometer Set
  Description   Set of 3 high precision Three Point Internal Micrometers for accurately measuring bores.

The self-centring measuring head consists of 3 laterally positioned carbide anvils offset at 120° intervals.

Their design allows these micrometers to measure down to 4mm of the bottom of a blind bore.   Contents  3 Micrometers: 6-8mm, 8-10mm & 10-12mm
100mm Extension Rod
Resolution: 0.001mm
Carbide Anvils
Knurled Ratchet Stops
Satin Chrome Finish
2 Calibration Ring Gauges
Adjusting Spanners