[Material]: Tool Steel Construction, chrome coating finish. Supplied with a blue plastic bag.
[Operation]: Choose the desired hole gauge, tighten the locking device clockwise, and measure with micrometer or caliper to determine the final hole size.
[Advantage]: This set is high performance solution for quickly checking the internal dimension. The rigid handle and double acting design can produce uniform contact pressure for more accurate measurements.
[Application]: It is used to quickly check the internal dimension, which is using for factories, schools, offices and other places.