Product details : MITUTOYO 368-996 3-POINT INTERNAL MICROMETER HOLTEST SET
A Mitutoyo internal micrometer set consisting of individual gauges, the appropriate setting rings and an extension tube for depth measurement applications. A ratchet guarantees repeatable measurement.
Strengths
•The Holtests (type II) have three contact points made of alloy steel Measurement can be taken closer to the bottom of the blind bore Measure deep holes using an extension rod (optional) With Ratchet Stop for constant force Setting rings for origin point settings are optional