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Telescoping Gage Set 5/16" - 6"
Under spring tension, the plungers expand from the center to the size of the hole being measured and are then locked in place by a knurled knob.Final hole size is obtained by measuring over the contacts with a micrometer or vernier caliper.Double action (self centering) for quick checking of inside measurements.Rigid handle with self centering feature.Contact point ends are hardened tool steel and precision ground on a radius of the smallest hole the gage will enter.
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