[High performance]: This set is an affordable solution for measuring bores.The rigid handle and double acting design (automatic centering) can quickly check the internal dimension. Smooth and constant spring tension can produce uniform contact pressure for more accurate measurements.
[Operation Method]: Choose the desired hole gauge, tighten the locking device clockwise and let its T part expand in the hole to be measured, use micrometer or caliper to measure and determine the final hole size.
[Exquisite package]: A easy storage box can protect and mantain the gauge better and keep a accurate measurements in a long time.