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<p>[QUOTE=&quot;Anthony Cultreri, post: 583454, member: 10524&quot;]It&#039;s a set of hole bore gauges, used to measure the inside diameter of a hole. You push the spring-loaded parts inward and then tighten the screw, which holds them in place. Then you put it into a hole, and release the screw so they expand again, and then tighten the screw, again. Then you can remove it from the hole and measure it to get the correct diameter. Useful for mechanics, machinists, instrument makers, all sorts of trades. I sold tools for 20+ years... : )[/QUOTE]</p><p><br /></p>

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