Helps in quick checking of holes, slots and recesses up to 6 inches deep. Double-action handles are rigidly attached to the plungers and are automatically self-centering. Constant spring tension provides uniform pressure. Both contact tips are made of head-treated steel and precision ground to a radius that provides proper clearance on the smallest hole the gauge will enter. Super quality, high rigidity, good resistance to wear, durable in use. Specification: Condition: Brand New Material: Tool Steel Color: Shown as picture Measuring Range: 8-150mm Accuracy: 0.1 Quantity: 6pcs/set (ABCDEF) Scope of application: Telescopic spring plunger into the hole (or groove), can perform inner diameter detection, used with micrometer or caliper, with knurled locking device. Package List: 1 Set Telescopic Gauge (6pcs)