MITUTOYO 368-101 6 to 8MM Holtest Inside Bore Micrometer with Carbide Insert You are Purchasing a a Mitutoyo 6 to 8mm Holtest Internal 3 Point Carbide Micrometer with Carbide Insert Master, Model 368-101. These Holtests are versatile, self-centering three-point internal micrometers for the accurate and efficient direct-measurement of internal diameters. Three anvils, evenly spaced at 120 apart, contact the internal wall surfaces and find true alignment with the axis of the bore for accurate ID measurement. FEATURES Carbide Anvils 6 to 8 mm Measuring Capacity .001mm Graduation 3 measuring depth With Ratchet Stop for constant force. Includes carbide insert setting master shown This item is manufactured by the worlds largest metrology company, founded in 1934 that creates the most advanced micrometers, calipers, indicators and other measurement tools in the world. We have lots of quality inspection tools available. Additional prep fees may apply.