Product Features

• 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 deg apart, contact the internal wall surfaces and find true alignment with the axis of the bore for accurate ID measurement• Highly durable because of carbide tipped contact points (anvils)• Measurement can be taken closer to the bottom of the blind bore• With ratchet stop for constant force• Supplied in fitted plastic case