5/16" - 6" (8mm to 150mm), Stainless Steel Construction.
This bore gauge expands in a hole to be measured , locks in place and then removed to determine final hole size using a micrometer or calipers. It is suitable for measuring the inner diameter of holes, such as the inside of cylinders and bores of engines.
Includes 6 sets, with vinyl case
The contact point of this machinist tool is hardened tool steel and is fine ground within the final measuring radius
The spring is equipped with a knurled locking knob and a knurled fixing area.
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