SPI Hole Mike 3-Point Internal Micrometer Set Specifications Include... 0.800" - 2.000" Measuring Range 0.0002" Readings 3.15" Measuring Depth Includes Setting Rings Includes 6" Depth Extension Accuracies... 0.800" - 1.000" : + 0.00016" 1.000" - 1.200" : + 0.00016" 1.200" - 1.600" : + 0.00016" 1.600" - 2.000" : + 0.00016" 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 thimble Includes Certificate of Calibration
