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21-890-9 Hole Mike Set .275" - .500"

21-890-9 Hole Mike Set .275" - .500"

SPI Hole Mike 3-Point Internal Micrometer Set

Specifications Include...

  • 0.275" - 0.500" Measuring Range
  • 0.0001" Readings
  • 2.00" Measuring Depth
  • Includes Setting Rings
  • Includes 4" Depth Extension

Features include...

  • Three point internal micrometer for precise, direct measurement of bore diameters.
  • Self aligning and self centering
  • Carbide measuring anvils
  • Suitable to measure to within .050" of bottom of blind hole, up to 4" capacity
  • Feelers taper toward the back for positive reading of the front edge
  • Ratchet stop provides uniform measuring pressure